mirror of
https://github.com/xenia-project/FFmpeg.git
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9ea6d2149e
Some decoders may not need a writable buffer in some specific cases, but only a reference to the existing buffer with updated frame properties instead, for the purpose of returning duplicate frames. For this, the FF_REGET_BUFFER_FLAG_READONLY flag is added, which will prevent potential allocations and buffer copies when they are not needed. Signed-off-by: James Almer <jamrial@gmail.com>
180 lines
5.2 KiB
C
180 lines
5.2 KiB
C
/*
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* Microsoft RLE video decoder
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* Copyright (C) 2003 The FFmpeg project
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* MS RLE video decoder by Mike Melanson (melanson@pcisys.net)
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* For more information about the MS RLE format, visit:
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* http://www.pcisys.net/~melanson/codecs/
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*
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* The MS RLE decoder outputs PAL8 colorspace data.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "avcodec.h"
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#include "internal.h"
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#include "msrledec.h"
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#include "libavutil/imgutils.h"
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typedef struct MsrleContext {
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AVCodecContext *avctx;
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AVFrame *frame;
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GetByteContext gb;
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uint32_t pal[256];
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} MsrleContext;
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static av_cold int msrle_decode_init(AVCodecContext *avctx)
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{
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MsrleContext *s = avctx->priv_data;
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int i;
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s->avctx = avctx;
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switch (avctx->bits_per_coded_sample) {
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case 1:
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avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
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break;
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case 4:
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case 8:
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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break;
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case 24:
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avctx->pix_fmt = AV_PIX_FMT_BGR24;
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "unsupported bits per sample\n");
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return AVERROR_INVALIDDATA;
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}
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s->frame = av_frame_alloc();
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if (!s->frame)
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return AVERROR(ENOMEM);
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if (avctx->extradata_size >= 4)
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for (i = 0; i < FFMIN(avctx->extradata_size, AVPALETTE_SIZE)/4; i++)
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s->pal[i] = 0xFFU<<24 | AV_RL32(avctx->extradata+4*i);
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return 0;
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}
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static int msrle_decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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MsrleContext *s = avctx->priv_data;
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int istride = FFALIGN(avctx->width*avctx->bits_per_coded_sample, 32) / 8;
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int ret;
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if (buf_size < 2) //Minimally a end of picture code should be there
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return AVERROR_INVALIDDATA;
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if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
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return ret;
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if (avctx->bits_per_coded_sample > 1 && avctx->bits_per_coded_sample <= 8) {
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int size;
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const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size);
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if (pal && size == AVPALETTE_SIZE) {
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s->frame->palette_has_changed = 1;
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memcpy(s->pal, pal, AVPALETTE_SIZE);
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} else if (pal) {
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av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size);
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}
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/* make the palette available */
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memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE);
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}
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/* FIXME how to correctly detect RLE ??? */
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if (avctx->height * istride == avpkt->size) { /* assume uncompressed */
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int linesize = av_image_get_linesize(avctx->pix_fmt, avctx->width, 0);
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uint8_t *ptr = s->frame->data[0];
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uint8_t *buf = avpkt->data + (avctx->height-1)*istride;
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int i, j;
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if (linesize < 0)
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return linesize;
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for (i = 0; i < avctx->height; i++) {
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if (avctx->bits_per_coded_sample == 4) {
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for (j = 0; j < avctx->width - 1; j += 2) {
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ptr[j+0] = buf[j>>1] >> 4;
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ptr[j+1] = buf[j>>1] & 0xF;
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}
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if (avctx->width & 1)
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ptr[j+0] = buf[j>>1] >> 4;
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} else {
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memcpy(ptr, buf, linesize);
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}
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buf -= istride;
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ptr += s->frame->linesize[0];
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}
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} else {
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bytestream2_init(&s->gb, buf, buf_size);
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ff_msrle_decode(avctx, s->frame, avctx->bits_per_coded_sample, &s->gb);
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}
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if ((ret = av_frame_ref(data, s->frame)) < 0)
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return ret;
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*got_frame = 1;
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/* report that the buffer was completely consumed */
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return buf_size;
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}
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static void msrle_decode_flush(AVCodecContext *avctx)
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{
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MsrleContext *s = avctx->priv_data;
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av_frame_unref(s->frame);
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}
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static av_cold int msrle_decode_end(AVCodecContext *avctx)
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{
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MsrleContext *s = avctx->priv_data;
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/* release the last frame */
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av_frame_free(&s->frame);
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return 0;
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}
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AVCodec ff_msrle_decoder = {
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.name = "msrle",
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.long_name = NULL_IF_CONFIG_SMALL("Microsoft RLE"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_MSRLE,
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.priv_data_size = sizeof(MsrleContext),
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.init = msrle_decode_init,
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.close = msrle_decode_end,
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.decode = msrle_decode_frame,
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.flush = msrle_decode_flush,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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