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FFmpeg/libavcodec/utils.c
Anton Khirnov e0ab5078a7 lavc: do not force the emu edge flag 
The default get_buffer2() implementation (and possibly some
user ones) does not allocate edges when this flag is set, which may
expose bugs in some decoders. Until the 10 release is out, it is safer
to remove this part.
2014-01-21 17:54:09 +01:00

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/*
* utils for libavcodec
* Copyright (c) 2001 Fabrice Bellard
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* utils.
*/
#include "config.h"
#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/crc.h"
#include "libavutil/frame.h"
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
#include "libavutil/pixdesc.h"
#include "libavutil/imgutils.h"
#include "libavutil/samplefmt.h"
#include "libavutil/dict.h"
#include "avcodec.h"
#include "dsputil.h"
#include "libavutil/opt.h"
#include "thread.h"
#include "internal.h"
#include "bytestream.h"
#include "version.h"
#include <stdlib.h>
#include <stdarg.h>
#include <limits.h>
#include <float.h>
static int volatile entangled_thread_counter = 0;
static int (*lockmgr_cb)(void **mutex, enum AVLockOp op);
static void *codec_mutex;
static void *avformat_mutex;
#if FF_API_FAST_MALLOC && CONFIG_SHARED && HAVE_SYMVER
FF_SYMVER(void*, av_fast_realloc, (void *ptr, unsigned int *size, size_t min_size), "LIBAVCODEC_55")
{
return av_fast_realloc(ptr, size, min_size);
}
FF_SYMVER(void, av_fast_malloc, (void *ptr, unsigned int *size, size_t min_size), "LIBAVCODEC_55")
{
av_fast_malloc(ptr, size, min_size);
}
#endif
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
{
void **p = ptr;
if (min_size > SIZE_MAX - FF_INPUT_BUFFER_PADDING_SIZE) {
av_freep(p);
*size = 0;
return;
}
av_fast_malloc(p, size, min_size + FF_INPUT_BUFFER_PADDING_SIZE);
if (*size)
memset((uint8_t *)*p + min_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
}
/* encoder management */
static AVCodec *first_avcodec = NULL;
AVCodec *av_codec_next(const AVCodec *c)
{
if (c)
return c->next;
else
return first_avcodec;
}
static av_cold void avcodec_init(void)
{
static int initialized = 0;
if (initialized != 0)
return;
initialized = 1;
if (CONFIG_DSPUTIL)
ff_dsputil_static_init();
}
int av_codec_is_encoder(const AVCodec *codec)
{
return codec && (codec->encode_sub || codec->encode2);
}
int av_codec_is_decoder(const AVCodec *codec)
{
return codec && codec->decode;
}
av_cold void avcodec_register(AVCodec *codec)
{
AVCodec **p;
avcodec_init();
p = &first_avcodec;
while (*p != NULL)
p = &(*p)->next;
*p = codec;
codec->next = NULL;
if (codec->init_static_data)
codec->init_static_data(codec);
}
#if FF_API_EMU_EDGE
unsigned avcodec_get_edge_width(void)
{
return EDGE_WIDTH;
}
#endif
#if FF_API_SET_DIMENSIONS
void avcodec_set_dimensions(AVCodecContext *s, int width, int height)
{
ff_set_dimensions(s, width, height);
}
#endif
int ff_set_dimensions(AVCodecContext *s, int width, int height)
{
int ret = av_image_check_size(width, height, 0, s);
if (ret < 0)
width = height = 0;
s->width = s->coded_width = width;
s->height = s->coded_height = height;
return ret;
}
int ff_side_data_update_matrix_encoding(AVFrame *frame,
enum AVMatrixEncoding matrix_encoding)
{
AVFrameSideData *side_data;
enum AVMatrixEncoding *data;
side_data = av_frame_get_side_data(frame, AV_FRAME_DATA_MATRIXENCODING);
if (!side_data)
side_data = av_frame_new_side_data(frame, AV_FRAME_DATA_MATRIXENCODING,
sizeof(enum AVMatrixEncoding));
if (!side_data)
return AVERROR(ENOMEM);
data = (enum AVMatrixEncoding*)side_data->data;
*data = matrix_encoding;
return 0;
}
#if HAVE_NEON || ARCH_PPC || HAVE_MMX
# define STRIDE_ALIGN 16
#else
# define STRIDE_ALIGN 8
#endif
void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
int linesize_align[AV_NUM_DATA_POINTERS])
{
int i;
int w_align = 1;
int h_align = 1;
switch (s->pix_fmt) {
case AV_PIX_FMT_YUV420P:
case AV_PIX_FMT_YUYV422:
case AV_PIX_FMT_UYVY422:
case AV_PIX_FMT_YUV422P:
case AV_PIX_FMT_YUV440P:
case AV_PIX_FMT_YUV444P:
case AV_PIX_FMT_GBRP:
case AV_PIX_FMT_GRAY8:
case AV_PIX_FMT_GRAY16BE:
case AV_PIX_FMT_GRAY16LE:
case AV_PIX_FMT_YUVJ420P:
case AV_PIX_FMT_YUVJ422P:
case AV_PIX_FMT_YUVJ440P:
case AV_PIX_FMT_YUVJ444P:
case AV_PIX_FMT_YUVA420P:
case AV_PIX_FMT_YUVA422P:
case AV_PIX_FMT_YUVA444P:
case AV_PIX_FMT_YUV420P9LE:
case AV_PIX_FMT_YUV420P9BE:
case AV_PIX_FMT_YUV420P10LE:
case AV_PIX_FMT_YUV420P10BE:
case AV_PIX_FMT_YUV422P9LE:
case AV_PIX_FMT_YUV422P9BE:
case AV_PIX_FMT_YUV422P10LE:
case AV_PIX_FMT_YUV422P10BE:
case AV_PIX_FMT_YUVA422P10LE:
case AV_PIX_FMT_YUVA422P10BE:
case AV_PIX_FMT_YUV444P9LE:
case AV_PIX_FMT_YUV444P9BE:
case AV_PIX_FMT_YUV444P10LE:
case AV_PIX_FMT_YUV444P10BE:
case AV_PIX_FMT_YUVA444P10LE:
case AV_PIX_FMT_YUVA444P10BE:
case AV_PIX_FMT_GBRP9LE:
case AV_PIX_FMT_GBRP9BE:
case AV_PIX_FMT_GBRP10LE:
case AV_PIX_FMT_GBRP10BE:
w_align = 16; //FIXME assume 16 pixel per macroblock
h_align = 16 * 2; // interlaced needs 2 macroblocks height
break;
case AV_PIX_FMT_YUV411P:
case AV_PIX_FMT_UYYVYY411:
w_align = 32;
h_align = 8;
break;
case AV_PIX_FMT_YUV410P:
if (s->codec_id == AV_CODEC_ID_SVQ1) {
w_align = 64;
h_align = 64;
}
case AV_PIX_FMT_RGB555:
if (s->codec_id == AV_CODEC_ID_RPZA) {
w_align = 4;
h_align = 4;
}
case AV_PIX_FMT_PAL8:
case AV_PIX_FMT_BGR8:
case AV_PIX_FMT_RGB8:
if (s->codec_id == AV_CODEC_ID_SMC) {
w_align = 4;
h_align = 4;
}
break;
case AV_PIX_FMT_BGR24:
if ((s->codec_id == AV_CODEC_ID_MSZH) ||
(s->codec_id == AV_CODEC_ID_ZLIB)) {
w_align = 4;
h_align = 4;
}
break;
default:
w_align = 1;
h_align = 1;
break;
}
*width = FFALIGN(*width, w_align);
*height = FFALIGN(*height, h_align);
if (s->codec_id == AV_CODEC_ID_H264)
// some of the optimized chroma MC reads one line too much
*height += 2;
for (i = 0; i < 4; i++)
linesize_align[i] = STRIDE_ALIGN;
}
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
int chroma_shift = desc->log2_chroma_w;
int linesize_align[AV_NUM_DATA_POINTERS];
int align;
avcodec_align_dimensions2(s, width, height, linesize_align);
align = FFMAX(linesize_align[0], linesize_align[3]);
linesize_align[1] <<= chroma_shift;
linesize_align[2] <<= chroma_shift;
align = FFMAX3(align, linesize_align[1], linesize_align[2]);
*width = FFALIGN(*width, align);
}
int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
enum AVSampleFormat sample_fmt, const uint8_t *buf,
int buf_size, int align)
{
int ch, planar, needed_size, ret = 0;
needed_size = av_samples_get_buffer_size(NULL, nb_channels,
frame->nb_samples, sample_fmt,
align);
if (buf_size < needed_size)
return AVERROR(EINVAL);
planar = av_sample_fmt_is_planar(sample_fmt);
if (planar && nb_channels > AV_NUM_DATA_POINTERS) {
if (!(frame->extended_data = av_mallocz(nb_channels *
sizeof(*frame->extended_data))))
return AVERROR(ENOMEM);
} else {
frame->extended_data = frame->data;
}
if ((ret = av_samples_fill_arrays(frame->extended_data, &frame->linesize[0],
buf, nb_channels, frame->nb_samples,
sample_fmt, align)) < 0) {
if (frame->extended_data != frame->data)
av_free(frame->extended_data);
return ret;
}
if (frame->extended_data != frame->data) {
for (ch = 0; ch < AV_NUM_DATA_POINTERS; ch++)
frame->data[ch] = frame->extended_data[ch];
}
return ret;
}
static int update_frame_pool(AVCodecContext *avctx, AVFrame *frame)
{
FramePool *pool = avctx->internal->pool;
int i, ret;
switch (avctx->codec_type) {
case AVMEDIA_TYPE_VIDEO: {
AVPicture picture;
int size[4] = { 0 };
int w = frame->width;
int h = frame->height;
int tmpsize, unaligned;
if (pool->format == frame->format &&
pool->width == frame->width && pool->height == frame->height)
return 0;
avcodec_align_dimensions2(avctx, &w, &h, pool->stride_align);
if (!(avctx->flags & CODEC_FLAG_EMU_EDGE)) {
w += EDGE_WIDTH * 2;
h += EDGE_WIDTH * 2;
}
do {
// NOTE: do not align linesizes individually, this breaks e.g. assumptions
// that linesize[0] == 2*linesize[1] in the MPEG-encoder for 4:2:2
av_image_fill_linesizes(picture.linesize, avctx->pix_fmt, w);
// increase alignment of w for next try (rhs gives the lowest bit set in w)
w += w & ~(w - 1);
unaligned = 0;
for (i = 0; i < 4; i++)
unaligned |= picture.linesize[i] % pool->stride_align[i];
} while (unaligned);
tmpsize = av_image_fill_pointers(picture.data, avctx->pix_fmt, h,
NULL, picture.linesize);
if (tmpsize < 0)
return -1;
for (i = 0; i < 3 && picture.data[i + 1]; i++)
size[i] = picture.data[i + 1] - picture.data[i];
size[i] = tmpsize - (picture.data[i] - picture.data[0]);
for (i = 0; i < 4; i++) {
av_buffer_pool_uninit(&pool->pools[i]);
pool->linesize[i] = picture.linesize[i];
if (size[i]) {
pool->pools[i] = av_buffer_pool_init(size[i] + 16, NULL);
if (!pool->pools[i]) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
}
pool->format = frame->format;
pool->width = frame->width;
pool->height = frame->height;
break;
}
case AVMEDIA_TYPE_AUDIO: {
int ch = av_get_channel_layout_nb_channels(frame->channel_layout);
int planar = av_sample_fmt_is_planar(frame->format);
int planes = planar ? ch : 1;
if (pool->format == frame->format && pool->planes == planes &&
pool->channels == ch && frame->nb_samples == pool->samples)
return 0;
av_buffer_pool_uninit(&pool->pools[0]);
ret = av_samples_get_buffer_size(&pool->linesize[0], ch,
frame->nb_samples, frame->format, 0);
if (ret < 0)
goto fail;
pool->pools[0] = av_buffer_pool_init(pool->linesize[0], NULL);
if (!pool->pools[0]) {
ret = AVERROR(ENOMEM);
goto fail;
}
pool->format = frame->format;
pool->planes = planes;
pool->channels = ch;
pool->samples = frame->nb_samples;
break;
}
default: av_assert0(0);
}
return 0;
fail:
for (i = 0; i < 4; i++)
av_buffer_pool_uninit(&pool->pools[i]);
pool->format = -1;
pool->planes = pool->channels = pool->samples = 0;
pool->width = pool->height = 0;
return ret;
}
static int audio_get_buffer(AVCodecContext *avctx, AVFrame *frame)
{
FramePool *pool = avctx->internal->pool;
int planes = pool->planes;
int i;
frame->linesize[0] = pool->linesize[0];
if (planes > AV_NUM_DATA_POINTERS) {
frame->extended_data = av_mallocz(planes * sizeof(*frame->extended_data));
frame->nb_extended_buf = planes - AV_NUM_DATA_POINTERS;
frame->extended_buf = av_mallocz(frame->nb_extended_buf *
sizeof(*frame->extended_buf));
if (!frame->extended_data || !frame->extended_buf) {
av_freep(&frame->extended_data);
av_freep(&frame->extended_buf);
return AVERROR(ENOMEM);
}
} else
frame->extended_data = frame->data;
for (i = 0; i < FFMIN(planes, AV_NUM_DATA_POINTERS); i++) {
frame->buf[i] = av_buffer_pool_get(pool->pools[0]);
if (!frame->buf[i])
goto fail;
frame->extended_data[i] = frame->data[i] = frame->buf[i]->data;
}
for (i = 0; i < frame->nb_extended_buf; i++) {
frame->extended_buf[i] = av_buffer_pool_get(pool->pools[0]);
if (!frame->extended_buf[i])
goto fail;
frame->extended_data[i + AV_NUM_DATA_POINTERS] = frame->extended_buf[i]->data;
}
if (avctx->debug & FF_DEBUG_BUFFERS)
av_log(avctx, AV_LOG_DEBUG, "default_get_buffer called on frame %p", frame);
return 0;
fail:
av_frame_unref(frame);
return AVERROR(ENOMEM);
}
static int video_get_buffer(AVCodecContext *s, AVFrame *pic)
{
FramePool *pool = s->internal->pool;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pic->format);
int pixel_size = desc->comp[0].step_minus1 + 1;
int h_chroma_shift, v_chroma_shift;
int i;
if (pic->data[0] != NULL) {
av_log(s, AV_LOG_ERROR, "pic->data[0]!=NULL in avcodec_default_get_buffer\n");
return -1;
}
memset(pic->data, 0, sizeof(pic->data));
pic->extended_data = pic->data;
av_pix_fmt_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
for (i = 0; i < 4 && pool->pools[i]; i++) {
const int h_shift = i == 0 ? 0 : h_chroma_shift;
const int v_shift = i == 0 ? 0 : v_chroma_shift;
pic->linesize[i] = pool->linesize[i];
pic->buf[i] = av_buffer_pool_get(pool->pools[i]);
if (!pic->buf[i])
goto fail;
// no edge if EDGE EMU or not planar YUV
if ((s->flags & CODEC_FLAG_EMU_EDGE) || !pool->pools[2])
pic->data[i] = pic->buf[i]->data;
else {
pic->data[i] = pic->buf[i]->data +
FFALIGN((pic->linesize[i] * EDGE_WIDTH >> v_shift) +
(pixel_size * EDGE_WIDTH >> h_shift), pool->stride_align[i]);
}
}
for (; i < AV_NUM_DATA_POINTERS; i++) {
pic->data[i] = NULL;
pic->linesize[i] = 0;
}
if (pic->data[1] && !pic->data[2])
avpriv_set_systematic_pal2((uint32_t *)pic->data[1], s->pix_fmt);
if (s->debug & FF_DEBUG_BUFFERS)
av_log(s, AV_LOG_DEBUG, "default_get_buffer called on pic %p\n", pic);
return 0;
fail:
av_frame_unref(pic);
return AVERROR(ENOMEM);
}
int avcodec_default_get_buffer2(AVCodecContext *avctx, AVFrame *frame, int flags)
{
int ret;
if ((ret = update_frame_pool(avctx, frame)) < 0)
return ret;
#if FF_API_GET_BUFFER
FF_DISABLE_DEPRECATION_WARNINGS
frame->type = FF_BUFFER_TYPE_INTERNAL;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
switch (avctx->codec_type) {
case AVMEDIA_TYPE_VIDEO:
return video_get_buffer(avctx, frame);
case AVMEDIA_TYPE_AUDIO:
return audio_get_buffer(avctx, frame);
default:
return -1;
}
}
#if FF_API_GET_BUFFER
FF_DISABLE_DEPRECATION_WARNINGS
int avcodec_default_get_buffer(AVCodecContext *avctx, AVFrame *frame)
{
return avcodec_default_get_buffer2(avctx, frame, 0);
}
typedef struct CompatReleaseBufPriv {
AVCodecContext avctx;
AVFrame frame;
} CompatReleaseBufPriv;
static void compat_free_buffer(void *opaque, uint8_t *data)
{
CompatReleaseBufPriv *priv = opaque;
if (priv->avctx.release_buffer)
priv->avctx.release_buffer(&priv->avctx, &priv->frame);
av_freep(&priv);
}
static void compat_release_buffer(void *opaque, uint8_t *data)
{
AVBufferRef *buf = opaque;
av_buffer_unref(&buf);
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
{
int override_dimensions = 1;
int ret;
switch (avctx->codec_type) {
case AVMEDIA_TYPE_VIDEO:
if (frame->width <= 0 || frame->height <= 0) {
frame->width = FFMAX(avctx->width, avctx->coded_width);
frame->height = FFMAX(avctx->height, avctx->coded_height);
override_dimensions = 0;
}
if (frame->format < 0)
frame->format = avctx->pix_fmt;
if (!frame->sample_aspect_ratio.num)
frame->sample_aspect_ratio = avctx->sample_aspect_ratio;
if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
return ret;
break;
case AVMEDIA_TYPE_AUDIO:
if (!frame->sample_rate)
frame->sample_rate = avctx->sample_rate;
if (frame->format < 0)
frame->format = avctx->sample_fmt;
if (!frame->channel_layout) {
if (avctx->channel_layout) {
if (av_get_channel_layout_nb_channels(avctx->channel_layout) !=
avctx->channels) {
av_log(avctx, AV_LOG_ERROR, "Inconsistent channel "
"configuration.\n");
return AVERROR(EINVAL);
}
frame->channel_layout = avctx->channel_layout;
} else {
if (avctx->channels > FF_SANE_NB_CHANNELS) {
av_log(avctx, AV_LOG_ERROR, "Too many channels: %d.\n",
avctx->channels);
return AVERROR(ENOSYS);
}
frame->channel_layout = av_get_default_channel_layout(avctx->channels);
if (!frame->channel_layout)
frame->channel_layout = (1ULL << avctx->channels) - 1;
}
}
break;
default: return AVERROR(EINVAL);
}
frame->pkt_pts = avctx->internal->pkt ? avctx->internal->pkt->pts : AV_NOPTS_VALUE;
frame->reordered_opaque = avctx->reordered_opaque;
#if FF_API_GET_BUFFER
FF_DISABLE_DEPRECATION_WARNINGS
/*
* Wrap an old get_buffer()-allocated buffer in an bunch of AVBuffers.
* We wrap each plane in its own AVBuffer. Each of those has a reference to
* a dummy AVBuffer as its private data, unreffing it on free.
* When all the planes are freed, the dummy buffer's free callback calls
* release_buffer().
*/
if (avctx->get_buffer) {
CompatReleaseBufPriv *priv = NULL;
AVBufferRef *dummy_buf = NULL;
int planes, i, ret;
if (flags & AV_GET_BUFFER_FLAG_REF)
frame->reference = 1;
ret = avctx->get_buffer(avctx, frame);
if (ret < 0)
return ret;
/* return if the buffers are already set up
* this would happen e.g. when a custom get_buffer() calls
* avcodec_default_get_buffer
*/
if (frame->buf[0])
return 0;
priv = av_mallocz(sizeof(*priv));
if (!priv) {
ret = AVERROR(ENOMEM);
goto fail;
}
priv->avctx = *avctx;
priv->frame = *frame;
dummy_buf = av_buffer_create(NULL, 0, compat_free_buffer, priv, 0);
if (!dummy_buf) {
ret = AVERROR(ENOMEM);
goto fail;
}
#define WRAP_PLANE(ref_out, data, data_size) \
do { \
AVBufferRef *dummy_ref = av_buffer_ref(dummy_buf); \
if (!dummy_ref) { \
ret = AVERROR(ENOMEM); \
goto fail; \
} \
ref_out = av_buffer_create(data, data_size, compat_release_buffer, \
dummy_ref, 0); \
if (!ref_out) { \
av_frame_unref(frame); \
ret = AVERROR(ENOMEM); \
goto fail; \
} \
} while (0)
if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
planes = av_pix_fmt_count_planes(frame->format);
/* workaround for AVHWAccel plane count of 0, buf[0] is used as
check for allocated buffers: make libavcodec happy */
if (desc && desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
planes = 1;
if (!desc || planes <= 0) {
ret = AVERROR(EINVAL);
goto fail;
}
for (i = 0; i < planes; i++) {
int v_shift = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
int plane_size = (frame->height >> v_shift) * frame->linesize[i];
WRAP_PLANE(frame->buf[i], frame->data[i], plane_size);
}
} else {
int planar = av_sample_fmt_is_planar(frame->format);
planes = planar ? avctx->channels : 1;
if (planes > FF_ARRAY_ELEMS(frame->buf)) {
frame->nb_extended_buf = planes - FF_ARRAY_ELEMS(frame->buf);
frame->extended_buf = av_malloc(sizeof(*frame->extended_buf) *
frame->nb_extended_buf);
if (!frame->extended_buf) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
for (i = 0; i < FFMIN(planes, FF_ARRAY_ELEMS(frame->buf)); i++)
WRAP_PLANE(frame->buf[i], frame->extended_data[i], frame->linesize[0]);
for (i = 0; i < frame->nb_extended_buf; i++)
WRAP_PLANE(frame->extended_buf[i],
frame->extended_data[i + FF_ARRAY_ELEMS(frame->buf)],
frame->linesize[0]);
}
av_buffer_unref(&dummy_buf);
frame->width = avctx->width;
frame->height = avctx->height;
return 0;
fail:
avctx->release_buffer(avctx, frame);
av_freep(&priv);
av_buffer_unref(&dummy_buf);
return ret;
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif
ret = avctx->get_buffer2(avctx, frame, flags);
if (avctx->codec_type == AVMEDIA_TYPE_VIDEO && !override_dimensions) {
frame->width = avctx->width;
frame->height = avctx->height;
}
return ret;
}
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
{
AVFrame tmp;
int ret;
av_assert0(avctx->codec_type == AVMEDIA_TYPE_VIDEO);
if (!frame->data[0])
return ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF);
if (av_frame_is_writable(frame))
return 0;
av_frame_move_ref(&tmp, frame);
ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF);
if (ret < 0) {
av_frame_unref(&tmp);
return ret;
}
av_image_copy(frame->data, frame->linesize, tmp.data, tmp.linesize,
frame->format, frame->width, frame->height);
av_frame_unref(&tmp);
return 0;
}
#if FF_API_GET_BUFFER
void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic)
{
av_frame_unref(pic);
}
int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic)
{
av_assert0(0);
return AVERROR_BUG;
}
#endif
int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
{
int i;
for (i = 0; i < count; i++) {
int r = func(c, (char *)arg + i * size);
if (ret)
ret[i] = r;
}
return 0;
}
int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int jobnr, int threadnr), void *arg, int *ret, int count)
{
int i;
for (i = 0; i < count; i++) {
int r = func(c, arg, i, 0);
if (ret)
ret[i] = r;
}
return 0;
}
static int is_hwaccel_pix_fmt(enum AVPixelFormat pix_fmt)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
return desc->flags & AV_PIX_FMT_FLAG_HWACCEL;
}
enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
{
while (*fmt != AV_PIX_FMT_NONE && is_hwaccel_pix_fmt(*fmt))
++fmt;
return fmt[0];
}
#if FF_API_AVFRAME_LAVC
void avcodec_get_frame_defaults(AVFrame *frame)
{
if (frame->extended_data != frame->data)
av_freep(&frame->extended_data);
memset(frame, 0, sizeof(AVFrame));
frame->pts = AV_NOPTS_VALUE;
frame->key_frame = 1;
frame->sample_aspect_ratio = (AVRational) {0, 1 };
frame->format = -1; /* unknown */
frame->extended_data = frame->data;
}
AVFrame *avcodec_alloc_frame(void)
{
AVFrame *frame = av_mallocz(sizeof(AVFrame));
if (frame == NULL)
return NULL;
avcodec_get_frame_defaults(frame);
return frame;
}
void avcodec_free_frame(AVFrame **frame)
{
av_frame_free(frame);
}
#endif
int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
{
int ret = 0;
AVDictionary *tmp = NULL;
if (avcodec_is_open(avctx))
return 0;
if ((!codec && !avctx->codec)) {
av_log(avctx, AV_LOG_ERROR, "No codec provided to avcodec_open2().\n");
return AVERROR(EINVAL);
}
if ((codec && avctx->codec && codec != avctx->codec)) {
av_log(avctx, AV_LOG_ERROR, "This AVCodecContext was allocated for %s, "
"but %s passed to avcodec_open2().\n", avctx->codec->name, codec->name);
return AVERROR(EINVAL);
}
if (!codec)
codec = avctx->codec;
if (avctx->extradata_size < 0 || avctx->extradata_size >= FF_MAX_EXTRADATA_SIZE)
return AVERROR(EINVAL);
if (options)
av_dict_copy(&tmp, *options, 0);
/* If there is a user-supplied mutex locking routine, call it. */
if (lockmgr_cb) {
if ((*lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
return -1;
}
entangled_thread_counter++;
if (entangled_thread_counter != 1) {
av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
ret = -1;
goto end;
}
avctx->internal = av_mallocz(sizeof(AVCodecInternal));
if (!avctx->internal) {
ret = AVERROR(ENOMEM);
goto end;
}
avctx->internal->pool = av_mallocz(sizeof(*avctx->internal->pool));
if (!avctx->internal->pool) {
ret = AVERROR(ENOMEM);
goto free_and_end;
}
avctx->internal->to_free = av_frame_alloc();
if (!avctx->internal->to_free) {
ret = AVERROR(ENOMEM);
goto free_and_end;
}
if (codec->priv_data_size > 0) {
if (!avctx->priv_data) {
avctx->priv_data = av_mallocz(codec->priv_data_size);
if (!avctx->priv_data) {
ret = AVERROR(ENOMEM);
goto end;
}
if (codec->priv_class) {
*(const AVClass **)avctx->priv_data = codec->priv_class;
av_opt_set_defaults(avctx->priv_data);
}
}
if (codec->priv_class && (ret = av_opt_set_dict(avctx->priv_data, &tmp)) < 0)
goto free_and_end;
} else {
avctx->priv_data = NULL;
}
if ((ret = av_opt_set_dict(avctx, &tmp)) < 0)
goto free_and_end;
if (avctx->coded_width && avctx->coded_height && !avctx->width && !avctx->height)
ret = ff_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
else if (avctx->width && avctx->height)
ret = ff_set_dimensions(avctx, avctx->width, avctx->height);
if (ret < 0)
goto free_and_end;
if ((avctx->coded_width || avctx->coded_height || avctx->width || avctx->height)
&& ( av_image_check_size(avctx->coded_width, avctx->coded_height, 0, avctx) < 0
|| av_image_check_size(avctx->width, avctx->height, 0, avctx) < 0)) {
av_log(avctx, AV_LOG_WARNING, "ignoring invalid width/height values\n");
ff_set_dimensions(avctx, 0, 0);
}
/* if the decoder init function was already called previously,
* free the already allocated subtitle_header before overwriting it */
if (av_codec_is_decoder(codec))
av_freep(&avctx->subtitle_header);
if (avctx->channels > FF_SANE_NB_CHANNELS) {
ret = AVERROR(EINVAL);
goto free_and_end;
}
avctx->codec = codec;
if ((avctx->codec_type == AVMEDIA_TYPE_UNKNOWN || avctx->codec_type == codec->type) &&
avctx->codec_id == AV_CODEC_ID_NONE) {
avctx->codec_type = codec->type;
avctx->codec_id = codec->id;
}
if (avctx->codec_id != codec->id || (avctx->codec_type != codec->type
&& avctx->codec_type != AVMEDIA_TYPE_ATTACHMENT)) {
av_log(avctx, AV_LOG_ERROR, "codec type or id mismatches\n");
ret = AVERROR(EINVAL);
goto free_and_end;
}
avctx->frame_number = 0;
if (avctx->codec->capabilities & CODEC_CAP_EXPERIMENTAL &&
avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
ret = AVERROR_EXPERIMENTAL;
goto free_and_end;
}
if (avctx->codec_type == AVMEDIA_TYPE_AUDIO &&
(!avctx->time_base.num || !avctx->time_base.den)) {
avctx->time_base.num = 1;
avctx->time_base.den = avctx->sample_rate;
}
if (HAVE_THREADS) {
ret = ff_thread_init(avctx);
if (ret < 0) {
goto free_and_end;
}
}
if (!HAVE_THREADS && !(codec->capabilities & CODEC_CAP_AUTO_THREADS))
avctx->thread_count = 1;
if (av_codec_is_encoder(avctx->codec)) {
int i;
if (avctx->codec->sample_fmts) {
for (i = 0; avctx->codec->sample_fmts[i] != AV_SAMPLE_FMT_NONE; i++) {
if (avctx->sample_fmt == avctx->codec->sample_fmts[i])
break;
if (avctx->channels == 1 &&
av_get_planar_sample_fmt(avctx->sample_fmt) ==
av_get_planar_sample_fmt(avctx->codec->sample_fmts[i])) {
avctx->sample_fmt = avctx->codec->sample_fmts[i];
break;
}
}
if (avctx->codec->sample_fmts[i] == AV_SAMPLE_FMT_NONE) {
av_log(avctx, AV_LOG_ERROR, "Specified sample_fmt is not supported.\n");
ret = AVERROR(EINVAL);
goto free_and_end;
}
}
if (avctx->codec->pix_fmts) {
for (i = 0; avctx->codec->pix_fmts[i] != AV_PIX_FMT_NONE; i++)
if (avctx->pix_fmt == avctx->codec->pix_fmts[i])
break;
if (avctx->codec->pix_fmts[i] == AV_PIX_FMT_NONE) {
av_log(avctx, AV_LOG_ERROR, "Specified pix_fmt is not supported\n");
ret = AVERROR(EINVAL);
goto free_and_end;
}
}
if (avctx->codec->supported_samplerates) {
for (i = 0; avctx->codec->supported_samplerates[i] != 0; i++)
if (avctx->sample_rate == avctx->codec->supported_samplerates[i])
break;
if (avctx->codec->supported_samplerates[i] == 0) {
av_log(avctx, AV_LOG_ERROR, "Specified sample_rate is not supported\n");
ret = AVERROR(EINVAL);
goto free_and_end;
}
}
if (avctx->codec->channel_layouts) {
if (!avctx->channel_layout) {
av_log(avctx, AV_LOG_WARNING, "channel_layout not specified\n");
} else {
for (i = 0; avctx->codec->channel_layouts[i] != 0; i++)
if (avctx->channel_layout == avctx->codec->channel_layouts[i])
break;
if (avctx->codec->channel_layouts[i] == 0) {
av_log(avctx, AV_LOG_ERROR, "Specified channel_layout is not supported\n");
ret = AVERROR(EINVAL);
goto free_and_end;
}
}
}
if (avctx->channel_layout && avctx->channels) {
if (av_get_channel_layout_nb_channels(avctx->channel_layout) != avctx->channels) {
av_log(avctx, AV_LOG_ERROR, "channel layout does not match number of channels\n");
ret = AVERROR(EINVAL);
goto free_and_end;
}
} else if (avctx->channel_layout) {
avctx->channels = av_get_channel_layout_nb_channels(avctx->channel_layout);
}
if (!avctx->rc_initial_buffer_occupancy)
avctx->rc_initial_buffer_occupancy = avctx->rc_buffer_size * 3 / 4;
}
if (avctx->codec->init && !(avctx->active_thread_type & FF_THREAD_FRAME)) {
ret = avctx->codec->init(avctx);
if (ret < 0) {
goto free_and_end;
}
}
if (av_codec_is_decoder(avctx->codec)) {
/* validate channel layout from the decoder */
if (avctx->channel_layout) {
int channels = av_get_channel_layout_nb_channels(avctx->channel_layout);
if (!avctx->channels)
avctx->channels = channels;
else if (channels != avctx->channels) {
av_log(avctx, AV_LOG_WARNING,
"channel layout does not match number of channels\n");
avctx->channel_layout = 0;
}
}
if (avctx->channels && avctx->channels < 0 ||
avctx->channels > FF_SANE_NB_CHANNELS) {
ret = AVERROR(EINVAL);
goto free_and_end;
}
}
end:
entangled_thread_counter--;
/* Release any user-supplied mutex. */
if (lockmgr_cb) {
(*lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
}
if (options) {
av_dict_free(options);
*options = tmp;
}
return ret;
free_and_end:
av_dict_free(&tmp);
av_freep(&avctx->priv_data);
if (avctx->internal) {
av_frame_free(&avctx->internal->to_free);
av_freep(&avctx->internal->pool);
}
av_freep(&avctx->internal);
avctx->codec = NULL;
goto end;
}
int ff_alloc_packet(AVPacket *avpkt, int size)
{
if (size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
return AVERROR(EINVAL);
if (avpkt->data) {
AVBufferRef *buf = avpkt->buf;
#if FF_API_DESTRUCT_PACKET
FF_DISABLE_DEPRECATION_WARNINGS
void *destruct = avpkt->destruct;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
if (avpkt->size < size)
return AVERROR(EINVAL);
av_init_packet(avpkt);
#if FF_API_DESTRUCT_PACKET
FF_DISABLE_DEPRECATION_WARNINGS
avpkt->destruct = destruct;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
avpkt->buf = buf;
avpkt->size = size;
return 0;
} else {
return av_new_packet(avpkt, size);
}
}
/**
* Pad last frame with silence.
*/
static int pad_last_frame(AVCodecContext *s, AVFrame **dst, const AVFrame *src)
{
AVFrame *frame = NULL;
int ret;
if (!(frame = av_frame_alloc()))
return AVERROR(ENOMEM);
frame->format = src->format;
frame->channel_layout = src->channel_layout;
frame->nb_samples = s->frame_size;
ret = av_frame_get_buffer(frame, 32);
if (ret < 0)
goto fail;
ret = av_frame_copy_props(frame, src);
if (ret < 0)
goto fail;
if ((ret = av_samples_copy(frame->extended_data, src->extended_data, 0, 0,
src->nb_samples, s->channels, s->sample_fmt)) < 0)
goto fail;
if ((ret = av_samples_set_silence(frame->extended_data, src->nb_samples,
frame->nb_samples - src->nb_samples,
s->channels, s->sample_fmt)) < 0)
goto fail;
*dst = frame;
return 0;
fail:
av_frame_free(&frame);
return ret;
}
int attribute_align_arg avcodec_encode_audio2(AVCodecContext *avctx,
AVPacket *avpkt,
const AVFrame *frame,
int *got_packet_ptr)
{
AVFrame tmp;
AVFrame *padded_frame = NULL;
int ret;
int user_packet = !!avpkt->data;
*got_packet_ptr = 0;
if (!(avctx->codec->capabilities & CODEC_CAP_DELAY) && !frame) {
av_free_packet(avpkt);
av_init_packet(avpkt);
return 0;
}
/* ensure that extended_data is properly set */
if (frame && !frame->extended_data) {
if (av_sample_fmt_is_planar(avctx->sample_fmt) &&
avctx->channels > AV_NUM_DATA_POINTERS) {
av_log(avctx, AV_LOG_ERROR, "Encoding to a planar sample format, "
"with more than %d channels, but extended_data is not set.\n",
AV_NUM_DATA_POINTERS);
return AVERROR(EINVAL);
}
av_log(avctx, AV_LOG_WARNING, "extended_data is not set.\n");
tmp = *frame;
tmp.extended_data = tmp.data;
frame = &tmp;
}
/* check for valid frame size */
if (frame) {
if (avctx->codec->capabilities & CODEC_CAP_SMALL_LAST_FRAME) {
if (frame->nb_samples > avctx->frame_size)
return AVERROR(EINVAL);
} else if (!(avctx->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE)) {
if (frame->nb_samples < avctx->frame_size &&
!avctx->internal->last_audio_frame) {
ret = pad_last_frame(avctx, &padded_frame, frame);
if (ret < 0)
return ret;
frame = padded_frame;
avctx->internal->last_audio_frame = 1;
}
if (frame->nb_samples != avctx->frame_size) {
ret = AVERROR(EINVAL);
goto end;
}
}
}
ret = avctx->codec->encode2(avctx, avpkt, frame, got_packet_ptr);
if (!ret) {
if (*got_packet_ptr) {
if (!(avctx->codec->capabilities & CODEC_CAP_DELAY)) {
if (avpkt->pts == AV_NOPTS_VALUE)
avpkt->pts = frame->pts;
if (!avpkt->duration)
avpkt->duration = ff_samples_to_time_base(avctx,
frame->nb_samples);
}
avpkt->dts = avpkt->pts;
} else {
avpkt->size = 0;
}
if (!user_packet && avpkt->size) {
ret = av_buffer_realloc(&avpkt->buf, avpkt->size);
if (ret >= 0)
avpkt->data = avpkt->buf->data;
}
avctx->frame_number++;
}
if (ret < 0 || !*got_packet_ptr) {
av_free_packet(avpkt);
av_init_packet(avpkt);
goto end;
}
/* NOTE: if we add any audio encoders which output non-keyframe packets,
* this needs to be moved to the encoders, but for now we can do it
* here to simplify things */
avpkt->flags |= AV_PKT_FLAG_KEY;
end:
av_frame_free(&padded_frame);
return ret;
}
int attribute_align_arg avcodec_encode_video2(AVCodecContext *avctx,
AVPacket *avpkt,
const AVFrame *frame,
int *got_packet_ptr)
{
int ret;
int user_packet = !!avpkt->data;
*got_packet_ptr = 0;
if (!(avctx->codec->capabilities & CODEC_CAP_DELAY) && !frame) {
av_free_packet(avpkt);
av_init_packet(avpkt);
avpkt->size = 0;
return 0;
}
if (av_image_check_size(avctx->width, avctx->height, 0, avctx))
return AVERROR(EINVAL);
av_assert0(avctx->codec->encode2);
ret = avctx->codec->encode2(avctx, avpkt, frame, got_packet_ptr);
if (!ret) {
if (!*got_packet_ptr)
avpkt->size = 0;
else if (!(avctx->codec->capabilities & CODEC_CAP_DELAY))
avpkt->pts = avpkt->dts = frame->pts;
if (!user_packet && avpkt->size) {
ret = av_buffer_realloc(&avpkt->buf, avpkt->size);
if (ret >= 0)
avpkt->data = avpkt->buf->data;
}
avctx->frame_number++;
}
if (ret < 0 || !*got_packet_ptr)
av_free_packet(avpkt);
emms_c();
return ret;
}
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
const AVSubtitle *sub)
{
int ret;
if (sub->start_display_time) {
av_log(avctx, AV_LOG_ERROR, "start_display_time must be 0.\n");
return -1;
}
if (sub->num_rects == 0 || !sub->rects)
return -1;
ret = avctx->codec->encode_sub(avctx, buf, buf_size, sub);
avctx->frame_number++;
return ret;
}
static int apply_param_change(AVCodecContext *avctx, AVPacket *avpkt)
{
int size = 0, ret;
const uint8_t *data;
uint32_t flags;
data = av_packet_get_side_data(avpkt, AV_PKT_DATA_PARAM_CHANGE, &size);
if (!data)
return 0;
if (!(avctx->codec->capabilities & CODEC_CAP_PARAM_CHANGE)) {
av_log(avctx, AV_LOG_ERROR, "This decoder does not support parameter "
"changes, but PARAM_CHANGE side data was sent to it.\n");
return AVERROR(EINVAL);
}
if (size < 4)
goto fail;
flags = bytestream_get_le32(&data);
size -= 4;
if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT) {
if (size < 4)
goto fail;
avctx->channels = bytestream_get_le32(&data);
size -= 4;
}
if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT) {
if (size < 8)
goto fail;
avctx->channel_layout = bytestream_get_le64(&data);
size -= 8;
}
if (flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE) {
if (size < 4)
goto fail;
avctx->sample_rate = bytestream_get_le32(&data);
size -= 4;
}
if (flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS) {
if (size < 8)
goto fail;
avctx->width = bytestream_get_le32(&data);
avctx->height = bytestream_get_le32(&data);
size -= 8;
ret = ff_set_dimensions(avctx, avctx->width, avctx->height);
if (ret < 0)
return ret;
}
return 0;
fail:
av_log(avctx, AV_LOG_ERROR, "PARAM_CHANGE side data too small.\n");
return AVERROR_INVALIDDATA;
}
static int unrefcount_frame(AVCodecInternal *avci, AVFrame *frame)
{
int ret;
/* move the original frame to our backup */
av_frame_unref(avci->to_free);
av_frame_move_ref(avci->to_free, frame);
/* now copy everything except the AVBufferRefs back
* note that we make a COPY of the side data, so calling av_frame_free() on
* the caller's frame will work properly */
ret = av_frame_copy_props(frame, avci->to_free);
if (ret < 0)
return ret;
memcpy(frame->data, avci->to_free->data, sizeof(frame->data));
memcpy(frame->linesize, avci->to_free->linesize, sizeof(frame->linesize));
if (avci->to_free->extended_data != avci->to_free->data) {
int planes = av_get_channel_layout_nb_channels(avci->to_free->channel_layout);
int size = planes * sizeof(*frame->extended_data);
if (!size) {
av_frame_unref(frame);
return AVERROR_BUG;
}
frame->extended_data = av_malloc(size);
if (!frame->extended_data) {
av_frame_unref(frame);
return AVERROR(ENOMEM);
}
memcpy(frame->extended_data, avci->to_free->extended_data,
size);
} else
frame->extended_data = frame->data;
frame->format = avci->to_free->format;
frame->width = avci->to_free->width;
frame->height = avci->to_free->height;
frame->channel_layout = avci->to_free->channel_layout;
frame->nb_samples = avci->to_free->nb_samples;
return 0;
}
int attribute_align_arg avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
int *got_picture_ptr,
AVPacket *avpkt)
{
AVCodecInternal *avci = avctx->internal;
int ret;
*got_picture_ptr = 0;
if ((avctx->coded_width || avctx->coded_height) && av_image_check_size(avctx->coded_width, avctx->coded_height, 0, avctx))
return -1;
avctx->internal->pkt = avpkt;
ret = apply_param_change(avctx, avpkt);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error applying parameter changes.\n");
if (avctx->err_recognition & AV_EF_EXPLODE)
return ret;
}
av_frame_unref(picture);
if ((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size || (avctx->active_thread_type & FF_THREAD_FRAME)) {
if (HAVE_THREADS && avctx->active_thread_type & FF_THREAD_FRAME)
ret = ff_thread_decode_frame(avctx, picture, got_picture_ptr,
avpkt);
else {
ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
avpkt);
picture->pkt_dts = avpkt->dts;
/* get_buffer is supposed to set frame parameters */
if (!(avctx->codec->capabilities & CODEC_CAP_DR1)) {
picture->sample_aspect_ratio = avctx->sample_aspect_ratio;
picture->width = avctx->width;
picture->height = avctx->height;
picture->format = avctx->pix_fmt;
}
}
emms_c(); //needed to avoid an emms_c() call before every return;
if (*got_picture_ptr) {
if (!avctx->refcounted_frames) {
int err = unrefcount_frame(avci, picture);
if (err < 0)
return err;
}
avctx->frame_number++;
} else
av_frame_unref(picture);
} else
ret = 0;
return ret;
}
int attribute_align_arg avcodec_decode_audio4(AVCodecContext *avctx,
AVFrame *frame,
int *got_frame_ptr,
AVPacket *avpkt)
{
AVCodecInternal *avci = avctx->internal;
int ret = 0;
*got_frame_ptr = 0;
avctx->internal->pkt = avpkt;
if (!avpkt->data && avpkt->size) {
av_log(avctx, AV_LOG_ERROR, "invalid packet: NULL data, size != 0\n");
return AVERROR(EINVAL);
}
ret = apply_param_change(avctx, avpkt);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error applying parameter changes.\n");
if (avctx->err_recognition & AV_EF_EXPLODE)
return ret;
}
av_frame_unref(frame);
if ((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size) {
ret = avctx->codec->decode(avctx, frame, got_frame_ptr, avpkt);
if (ret >= 0 && *got_frame_ptr) {
avctx->frame_number++;
frame->pkt_dts = avpkt->dts;
if (frame->format == AV_SAMPLE_FMT_NONE)
frame->format = avctx->sample_fmt;
if (!avctx->refcounted_frames) {
int err = unrefcount_frame(avci, frame);
if (err < 0)
return err;
}
} else
av_frame_unref(frame);
}
return ret;
}
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
int *got_sub_ptr,
AVPacket *avpkt)
{
int ret;
avctx->internal->pkt = avpkt;
*got_sub_ptr = 0;
ret = avctx->codec->decode(avctx, sub, got_sub_ptr, avpkt);
if (*got_sub_ptr)
avctx->frame_number++;
return ret;
}
void avsubtitle_free(AVSubtitle *sub)
{
int i;
for (i = 0; i < sub->num_rects; i++) {
av_freep(&sub->rects[i]->pict.data[0]);
av_freep(&sub->rects[i]->pict.data[1]);
av_freep(&sub->rects[i]->pict.data[2]);
av_freep(&sub->rects[i]->pict.data[3]);
av_freep(&sub->rects[i]->text);
av_freep(&sub->rects[i]->ass);
av_freep(&sub->rects[i]);
}
av_freep(&sub->rects);
memset(sub, 0, sizeof(AVSubtitle));
}
av_cold int avcodec_close(AVCodecContext *avctx)
{
/* If there is a user-supplied mutex locking routine, call it. */
if (lockmgr_cb) {
if ((*lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
return -1;
}
entangled_thread_counter++;
if (entangled_thread_counter != 1) {
av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
entangled_thread_counter--;
return -1;
}
if (avcodec_is_open(avctx)) {
FramePool *pool = avctx->internal->pool;
int i;
if (HAVE_THREADS && avctx->internal->thread_ctx)
ff_thread_free(avctx);
if (avctx->codec && avctx->codec->close)
avctx->codec->close(avctx);
avctx->coded_frame = NULL;
av_frame_free(&avctx->internal->to_free);
for (i = 0; i < FF_ARRAY_ELEMS(pool->pools); i++)
av_buffer_pool_uninit(&pool->pools[i]);
av_freep(&avctx->internal->pool);
av_freep(&avctx->internal);
}
if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
av_opt_free(avctx->priv_data);
av_opt_free(avctx);
av_freep(&avctx->priv_data);
if (av_codec_is_encoder(avctx->codec))
av_freep(&avctx->extradata);
avctx->codec = NULL;
avctx->active_thread_type = 0;
entangled_thread_counter--;
/* Release any user-supplied mutex. */
if (lockmgr_cb) {
(*lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
}
return 0;
}
static AVCodec *find_encdec(enum AVCodecID id, int encoder)
{
AVCodec *p, *experimental = NULL;
p = first_avcodec;
while (p) {
if ((encoder ? av_codec_is_encoder(p) : av_codec_is_decoder(p)) &&
p->id == id) {
if (p->capabilities & CODEC_CAP_EXPERIMENTAL && !experimental) {
experimental = p;
} else
return p;
}
p = p->next;
}
return experimental;
}
AVCodec *avcodec_find_encoder(enum AVCodecID id)
{
return find_encdec(id, 1);
}
AVCodec *avcodec_find_encoder_by_name(const char *name)
{
AVCodec *p;
if (!name)
return NULL;
p = first_avcodec;
while (p) {
if (av_codec_is_encoder(p) && strcmp(name, p->name) == 0)
return p;
p = p->next;
}
return NULL;
}
AVCodec *avcodec_find_decoder(enum AVCodecID id)
{
return find_encdec(id, 0);
}
AVCodec *avcodec_find_decoder_by_name(const char *name)
{
AVCodec *p;
if (!name)
return NULL;
p = first_avcodec;
while (p) {
if (av_codec_is_decoder(p) && strcmp(name, p->name) == 0)
return p;
p = p->next;
}
return NULL;
}
static int get_bit_rate(AVCodecContext *ctx)
{
int bit_rate;
int bits_per_sample;
switch (ctx->codec_type) {
case AVMEDIA_TYPE_VIDEO:
case AVMEDIA_TYPE_DATA:
case AVMEDIA_TYPE_SUBTITLE:
case AVMEDIA_TYPE_ATTACHMENT:
bit_rate = ctx->bit_rate;
break;
case AVMEDIA_TYPE_AUDIO:
bits_per_sample = av_get_bits_per_sample(ctx->codec_id);
bit_rate = bits_per_sample ? ctx->sample_rate * ctx->channels * bits_per_sample : ctx->bit_rate;
break;
default:
bit_rate = 0;
break;
}
return bit_rate;
}
size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag)
{
int i, len, ret = 0;
#define TAG_PRINT(x) \
(((x) >= '0' && (x) <= '9') || \
((x) >= 'a' && (x) <= 'z') || ((x) >= 'A' && (x) <= 'Z') || \
((x) == '.' || (x) == ' '))
for (i = 0; i < 4; i++) {
len = snprintf(buf, buf_size,
TAG_PRINT(codec_tag & 0xFF) ? "%c" : "[%d]", codec_tag & 0xFF);
buf += len;
buf_size = buf_size > len ? buf_size - len : 0;
ret += len;
codec_tag >>= 8;
}
return ret;
}
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
{
const char *codec_name;
const char *profile = NULL;
const AVCodec *p;
char buf1[32];
int bitrate;
AVRational display_aspect_ratio;
if (enc->codec)
p = enc->codec;
else if (encode)
p = avcodec_find_encoder(enc->codec_id);
else
p = avcodec_find_decoder(enc->codec_id);
if (p) {
codec_name = p->name;
profile = av_get_profile_name(p, enc->profile);
} else if (enc->codec_id == AV_CODEC_ID_MPEG2TS) {
/* fake mpeg2 transport stream codec (currently not
* registered) */
codec_name = "mpeg2ts";
} else if (enc->codec_name[0] != '\0') {
codec_name = enc->codec_name;
} else {
/* output avi tags */
char tag_buf[32];
av_get_codec_tag_string(tag_buf, sizeof(tag_buf), enc->codec_tag);
snprintf(buf1, sizeof(buf1), "%s / 0x%04X", tag_buf, enc->codec_tag);
codec_name = buf1;
}
switch (enc->codec_type) {
case AVMEDIA_TYPE_VIDEO:
snprintf(buf, buf_size,
"Video: %s%s",
codec_name, enc->mb_decision ? " (hq)" : "");
if (profile)
snprintf(buf + strlen(buf), buf_size - strlen(buf),
" (%s)", profile);
if (enc->pix_fmt != AV_PIX_FMT_NONE) {
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", %s",
av_get_pix_fmt_name(enc->pix_fmt));
}
if (enc->width) {
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", %dx%d",
enc->width, enc->height);
if (enc->sample_aspect_ratio.num) {
av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
enc->width * enc->sample_aspect_ratio.num,
enc->height * enc->sample_aspect_ratio.den,
1024 * 1024);
snprintf(buf + strlen(buf), buf_size - strlen(buf),
" [PAR %d:%d DAR %d:%d]",
enc->sample_aspect_ratio.num, enc->sample_aspect_ratio.den,
display_aspect_ratio.num, display_aspect_ratio.den);
}
if (av_log_get_level() >= AV_LOG_DEBUG) {
int g = av_gcd(enc->time_base.num, enc->time_base.den);
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", %d/%d",
enc->time_base.num / g, enc->time_base.den / g);
}
}
if (encode) {
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", q=%d-%d", enc->qmin, enc->qmax);
}
break;
case AVMEDIA_TYPE_AUDIO:
snprintf(buf, buf_size,
"Audio: %s",
codec_name);
if (profile)
snprintf(buf + strlen(buf), buf_size - strlen(buf),
" (%s)", profile);
if (enc->sample_rate) {
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", %d Hz", enc->sample_rate);
}
av_strlcat(buf, ", ", buf_size);
av_get_channel_layout_string(buf + strlen(buf), buf_size - strlen(buf), enc->channels, enc->channel_layout);
if (enc->sample_fmt != AV_SAMPLE_FMT_NONE) {
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", %s", av_get_sample_fmt_name(enc->sample_fmt));
}
break;
case AVMEDIA_TYPE_DATA:
snprintf(buf, buf_size, "Data: %s", codec_name);
break;
case AVMEDIA_TYPE_SUBTITLE:
snprintf(buf, buf_size, "Subtitle: %s", codec_name);
break;
case AVMEDIA_TYPE_ATTACHMENT:
snprintf(buf, buf_size, "Attachment: %s", codec_name);
break;
default:
snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
return;
}
if (encode) {
if (enc->flags & CODEC_FLAG_PASS1)
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", pass 1");
if (enc->flags & CODEC_FLAG_PASS2)
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", pass 2");
}
bitrate = get_bit_rate(enc);
if (bitrate != 0) {
snprintf(buf + strlen(buf), buf_size - strlen(buf),
", %d kb/s", bitrate / 1000);
}
}
const char *av_get_profile_name(const AVCodec *codec, int profile)
{
const AVProfile *p;
if (profile == FF_PROFILE_UNKNOWN || !codec->profiles)
return NULL;
for (p = codec->profiles; p->profile != FF_PROFILE_UNKNOWN; p++)
if (p->profile == profile)
return p->name;
return NULL;
}
unsigned avcodec_version(void)
{
return LIBAVCODEC_VERSION_INT;
}
const char *avcodec_configuration(void)
{
return LIBAV_CONFIGURATION;
}
const char *avcodec_license(void)
{
#define LICENSE_PREFIX "libavcodec license: "
return LICENSE_PREFIX LIBAV_LICENSE + sizeof(LICENSE_PREFIX) - 1;
}
void avcodec_flush_buffers(AVCodecContext *avctx)
{
if (HAVE_THREADS && avctx->active_thread_type & FF_THREAD_FRAME)
ff_thread_flush(avctx);
else if (avctx->codec->flush)
avctx->codec->flush(avctx);
if (!avctx->refcounted_frames)
av_frame_unref(avctx->internal->to_free);
}
int av_get_exact_bits_per_sample(enum AVCodecID codec_id)
{
switch (codec_id) {
case AV_CODEC_ID_ADPCM_CT:
case AV_CODEC_ID_ADPCM_IMA_APC:
case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:
case AV_CODEC_ID_ADPCM_IMA_WS:
case AV_CODEC_ID_ADPCM_G722:
case AV_CODEC_ID_ADPCM_YAMAHA:
return 4;
case AV_CODEC_ID_PCM_ALAW:
case AV_CODEC_ID_PCM_MULAW:
case AV_CODEC_ID_PCM_S8:
case AV_CODEC_ID_PCM_U8:
case AV_CODEC_ID_PCM_ZORK:
return 8;
case AV_CODEC_ID_PCM_S16BE:
case AV_CODEC_ID_PCM_S16LE:
case AV_CODEC_ID_PCM_S16LE_PLANAR:
case AV_CODEC_ID_PCM_U16BE:
case AV_CODEC_ID_PCM_U16LE:
return 16;
case AV_CODEC_ID_PCM_S24DAUD:
case AV_CODEC_ID_PCM_S24BE:
case AV_CODEC_ID_PCM_S24LE:
case AV_CODEC_ID_PCM_S24LE_PLANAR:
case AV_CODEC_ID_PCM_U24BE:
case AV_CODEC_ID_PCM_U24LE:
return 24;
case AV_CODEC_ID_PCM_S32BE:
case AV_CODEC_ID_PCM_S32LE:
case AV_CODEC_ID_PCM_S32LE_PLANAR:
case AV_CODEC_ID_PCM_U32BE:
case AV_CODEC_ID_PCM_U32LE:
case AV_CODEC_ID_PCM_F32BE:
case AV_CODEC_ID_PCM_F32LE:
return 32;
case AV_CODEC_ID_PCM_F64BE:
case AV_CODEC_ID_PCM_F64LE:
return 64;
default:
return 0;
}
}
int av_get_bits_per_sample(enum AVCodecID codec_id)
{
switch (codec_id) {
case AV_CODEC_ID_ADPCM_SBPRO_2:
return 2;
case AV_CODEC_ID_ADPCM_SBPRO_3:
return 3;
case AV_CODEC_ID_ADPCM_SBPRO_4:
case AV_CODEC_ID_ADPCM_IMA_WAV:
case AV_CODEC_ID_ADPCM_IMA_QT:
case AV_CODEC_ID_ADPCM_SWF:
case AV_CODEC_ID_ADPCM_MS:
return 4;
default:
return av_get_exact_bits_per_sample(codec_id);
}
}
int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
{
int id, sr, ch, ba, tag, bps;
id = avctx->codec_id;
sr = avctx->sample_rate;
ch = avctx->channels;
ba = avctx->block_align;
tag = avctx->codec_tag;
bps = av_get_exact_bits_per_sample(avctx->codec_id);
/* codecs with an exact constant bits per sample */
if (bps > 0 && ch > 0 && frame_bytes > 0)
return (frame_bytes * 8) / (bps * ch);
bps = avctx->bits_per_coded_sample;
/* codecs with a fixed packet duration */
switch (id) {
case AV_CODEC_ID_ADPCM_ADX: return 32;
case AV_CODEC_ID_ADPCM_IMA_QT: return 64;
case AV_CODEC_ID_ADPCM_EA_XAS: return 128;
case AV_CODEC_ID_AMR_NB:
case AV_CODEC_ID_GSM:
case AV_CODEC_ID_QCELP:
case AV_CODEC_ID_RA_144:
case AV_CODEC_ID_RA_288: return 160;
case AV_CODEC_ID_IMC: return 256;
case AV_CODEC_ID_AMR_WB:
case AV_CODEC_ID_GSM_MS: return 320;
case AV_CODEC_ID_MP1: return 384;
case AV_CODEC_ID_ATRAC1: return 512;
case AV_CODEC_ID_ATRAC3: return 1024;
case AV_CODEC_ID_MP2:
case AV_CODEC_ID_MUSEPACK7: return 1152;
case AV_CODEC_ID_AC3: return 1536;
}
if (sr > 0) {
/* calc from sample rate */
if (id == AV_CODEC_ID_TTA)
return 256 * sr / 245;
if (ch > 0) {
/* calc from sample rate and channels */
if (id == AV_CODEC_ID_BINKAUDIO_DCT)
return (480 << (sr / 22050)) / ch;
}
}
if (ba > 0) {
/* calc from block_align */
if (id == AV_CODEC_ID_SIPR) {
switch (ba) {
case 20: return 160;
case 19: return 144;
case 29: return 288;
case 37: return 480;
}
} else if (id == AV_CODEC_ID_ILBC) {
switch (ba) {
case 38: return 160;
case 50: return 240;
}
}
}
if (frame_bytes > 0) {
/* calc from frame_bytes only */
if (id == AV_CODEC_ID_TRUESPEECH)
return 240 * (frame_bytes / 32);
if (id == AV_CODEC_ID_NELLYMOSER)
return 256 * (frame_bytes / 64);
if (bps > 0) {
/* calc from frame_bytes and bits_per_coded_sample */
if (id == AV_CODEC_ID_ADPCM_G726)
return frame_bytes * 8 / bps;
}
if (ch > 0) {
/* calc from frame_bytes and channels */
switch (id) {
case AV_CODEC_ID_ADPCM_4XM:
case AV_CODEC_ID_ADPCM_IMA_ISS:
return (frame_bytes - 4 * ch) * 2 / ch;
case AV_CODEC_ID_ADPCM_IMA_SMJPEG:
return (frame_bytes - 4) * 2 / ch;
case AV_CODEC_ID_ADPCM_IMA_AMV:
return (frame_bytes - 8) * 2 / ch;
case AV_CODEC_ID_ADPCM_XA:
return (frame_bytes / 128) * 224 / ch;
case AV_CODEC_ID_INTERPLAY_DPCM:
return (frame_bytes - 6 - ch) / ch;
case AV_CODEC_ID_ROQ_DPCM:
return (frame_bytes - 8) / ch;
case AV_CODEC_ID_XAN_DPCM:
return (frame_bytes - 2 * ch) / ch;
case AV_CODEC_ID_MACE3:
return 3 * frame_bytes / ch;
case AV_CODEC_ID_MACE6:
return 6 * frame_bytes / ch;
case AV_CODEC_ID_PCM_LXF:
return 2 * (frame_bytes / (5 * ch));
}
if (tag) {
/* calc from frame_bytes, channels, and codec_tag */
if (id == AV_CODEC_ID_SOL_DPCM) {
if (tag == 3)
return frame_bytes / ch;
else
return frame_bytes * 2 / ch;
}
}
if (ba > 0) {
/* calc from frame_bytes, channels, and block_align */
int blocks = frame_bytes / ba;
switch (avctx->codec_id) {
case AV_CODEC_ID_ADPCM_IMA_WAV:
return blocks * (1 + (ba - 4 * ch) / (4 * ch) * 8);
case AV_CODEC_ID_ADPCM_IMA_DK3:
return blocks * (((ba - 16) * 2 / 3 * 4) / ch);
case AV_CODEC_ID_ADPCM_IMA_DK4:
return blocks * (1 + (ba - 4 * ch) * 2 / ch);
case AV_CODEC_ID_ADPCM_MS:
return blocks * (2 + (ba - 7 * ch) * 2 / ch);
}
}
if (bps > 0) {
/* calc from frame_bytes, channels, and bits_per_coded_sample */
switch (avctx->codec_id) {
case AV_CODEC_ID_PCM_DVD:
return 2 * (frame_bytes / ((bps * 2 / 8) * ch));
case AV_CODEC_ID_PCM_BLURAY:
return frame_bytes / ((FFALIGN(ch, 2) * bps) / 8);
case AV_CODEC_ID_S302M:
return 2 * (frame_bytes / ((bps + 4) / 4)) / ch;
}
}
}
}
return 0;
}
#if !HAVE_THREADS
int ff_thread_init(AVCodecContext *s)
{
return -1;
}
#endif
unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
{
unsigned int n = 0;
while (v >= 0xff) {
*s++ = 0xff;
v -= 0xff;
n++;
}
*s = v;
n++;
return n;
}
int ff_match_2uint16(const uint16_t(*tab)[2], int size, int a, int b)
{
int i;
for (i = 0; i < size && !(tab[i][0] == a && tab[i][1] == b); i++) ;
return i;
}
#if FF_API_MISSING_SAMPLE
FF_DISABLE_DEPRECATION_WARNINGS
void av_log_missing_feature(void *avc, const char *feature, int want_sample)
{
av_log(avc, AV_LOG_WARNING, "%s is not implemented. Update your Libav "
"version to the newest one from Git. If the problem still "
"occurs, it means that your file has a feature which has not "
"been implemented.\n", feature);
if(want_sample)
av_log_ask_for_sample(avc, NULL);
}
void av_log_ask_for_sample(void *avc, const char *msg, ...)
{
va_list argument_list;
va_start(argument_list, msg);
if (msg)
av_vlog(avc, AV_LOG_WARNING, msg, argument_list);
av_log(avc, AV_LOG_WARNING, "If you want to help, upload a sample "
"of this file to ftp://upload.libav.org/incoming/ "
"and contact the libav-devel mailing list.\n");
va_end(argument_list);
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif /* FF_API_MISSING_SAMPLE */
static AVHWAccel *first_hwaccel = NULL;
void av_register_hwaccel(AVHWAccel *hwaccel)
{
AVHWAccel **p = &first_hwaccel;
while (*p)
p = &(*p)->next;
*p = hwaccel;
hwaccel->next = NULL;
}
AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel)
{
return hwaccel ? hwaccel->next : first_hwaccel;
}
AVHWAccel *ff_find_hwaccel(AVCodecContext *avctx)
{
enum AVCodecID codec_id = avctx->codec->id;
enum AVPixelFormat pix_fmt = avctx->pix_fmt;
AVHWAccel *hwaccel = NULL;
while ((hwaccel = av_hwaccel_next(hwaccel)))
if (hwaccel->id == codec_id
&& hwaccel->pix_fmt == pix_fmt)
return hwaccel;
return NULL;
}
int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op))
{
if (lockmgr_cb) {
if (lockmgr_cb(&codec_mutex, AV_LOCK_DESTROY))
return -1;
if (lockmgr_cb(&avformat_mutex, AV_LOCK_DESTROY))
return -1;
}
lockmgr_cb = cb;
if (lockmgr_cb) {
if (lockmgr_cb(&codec_mutex, AV_LOCK_CREATE))
return -1;
if (lockmgr_cb(&avformat_mutex, AV_LOCK_CREATE))
return -1;
}
return 0;
}
int avpriv_lock_avformat(void)
{
if (lockmgr_cb) {
if ((*lockmgr_cb)(&avformat_mutex, AV_LOCK_OBTAIN))
return -1;
}
return 0;
}
int avpriv_unlock_avformat(void)
{
if (lockmgr_cb) {
if ((*lockmgr_cb)(&avformat_mutex, AV_LOCK_RELEASE))
return -1;
}
return 0;
}
unsigned int avpriv_toupper4(unsigned int x)
{
return av_toupper(x & 0xFF) +
(av_toupper((x >> 8) & 0xFF) << 8) +
(av_toupper((x >> 16) & 0xFF) << 16) +
(av_toupper((x >> 24) & 0xFF) << 24);
}
int ff_thread_ref_frame(ThreadFrame *dst, ThreadFrame *src)
{
int ret;
dst->owner = src->owner;
ret = av_frame_ref(dst->f, src->f);
if (ret < 0)
return ret;
if (src->progress &&
!(dst->progress = av_buffer_ref(src->progress))) {
ff_thread_release_buffer(dst->owner, dst);
return AVERROR(ENOMEM);
}
return 0;
}
#if !HAVE_THREADS
int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
{
f->owner = avctx;
return ff_get_buffer(avctx, f->f, flags);
}
void ff_thread_release_buffer(AVCodecContext *avctx, ThreadFrame *f)
{
av_frame_unref(f->f);
}
void ff_thread_finish_setup(AVCodecContext *avctx)
{
}
void ff_thread_report_progress(ThreadFrame *f, int progress, int field)
{
}
void ff_thread_await_progress(ThreadFrame *f, int progress, int field)
{
}
#endif
enum AVMediaType avcodec_get_type(enum AVCodecID codec_id)
{
if (codec_id <= AV_CODEC_ID_NONE)
return AVMEDIA_TYPE_UNKNOWN;
else if (codec_id < AV_CODEC_ID_FIRST_AUDIO)
return AVMEDIA_TYPE_VIDEO;
else if (codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
return AVMEDIA_TYPE_AUDIO;
else if (codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
return AVMEDIA_TYPE_SUBTITLE;
return AVMEDIA_TYPE_UNKNOWN;
}
int avcodec_is_open(AVCodecContext *s)
{
return !!s->internal;
}
const uint8_t *avpriv_find_start_code(const uint8_t *restrict p,
const uint8_t *end,
uint32_t * restrict state)
{
int i;
assert(p <= end);
if (p >= end)
return end;
for (i = 0; i < 3; i++) {
uint32_t tmp = *state << 8;
*state = tmp + *(p++);
if (tmp == 0x100 || p == end)
return p;
}
while (p < end) {
if (p[-1] > 1 ) p += 3;
else if (p[-2] ) p += 2;
else if (p[-3]|(p[-1]-1)) p++;
else {
p++;
break;
}
}
p = FFMIN(p, end) - 4;
*state = AV_RB32(p);
return p + 4;
}
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