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https://github.com/xenia-project/FFmpeg.git
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07558ad582
avoids a compiler warning Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
268 lines
9.3 KiB
C
268 lines
9.3 KiB
C
/*
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* libdcadec decoder wrapper
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* Copyright (C) 2015 Hendrik Leppkes
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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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#include <libdcadec/dca_context.h>
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#include "libavutil/channel_layout.h"
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#include "libavutil/common.h"
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#include "libavutil/opt.h"
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#include "avcodec.h"
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#include "dca.h"
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#include "dca_syncwords.h"
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#include "internal.h"
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typedef struct DCADecContext {
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struct dcadec_context *ctx;
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uint8_t *buffer;
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int buffer_size;
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int downmix_warned;
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} DCADecContext;
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static int dcadec_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame_ptr, AVPacket *avpkt)
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{
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DCADecContext *s = avctx->priv_data;
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AVFrame *frame = data;
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av_unused struct dcadec_exss_info *exss;
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int ret, i, k;
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int **samples, nsamples, channel_mask, sample_rate, bits_per_sample, profile;
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uint32_t mrk;
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uint8_t *input = avpkt->data;
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int input_size = avpkt->size;
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/* convert bytestream syntax to RAW BE format if required */
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if (input_size < 8) {
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av_log(avctx, AV_LOG_ERROR, "Input size too small\n");
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return AVERROR_INVALIDDATA;
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}
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mrk = AV_RB32(input);
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if (mrk != DCA_SYNCWORD_CORE_BE && mrk != DCA_SYNCWORD_SUBSTREAM) {
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s->buffer = av_fast_realloc(s->buffer, &s->buffer_size, avpkt->size + AV_INPUT_BUFFER_PADDING_SIZE);
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if (!s->buffer)
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return AVERROR(ENOMEM);
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for (i = 0, ret = AVERROR_INVALIDDATA; i < input_size - 3 && ret < 0; i++)
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ret = avpriv_dca_convert_bitstream(input + i, input_size - i, s->buffer, s->buffer_size);
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if (ret < 0)
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return ret;
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input = s->buffer;
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input_size = ret;
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}
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if ((ret = dcadec_context_parse(s->ctx, input, input_size)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "dcadec_context_parse() failed: %d (%s)\n", -ret, dcadec_strerror(ret));
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return AVERROR_EXTERNAL;
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}
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if ((ret = dcadec_context_filter(s->ctx, &samples, &nsamples, &channel_mask,
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&sample_rate, &bits_per_sample, &profile)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "dcadec_context_filter() failed: %d (%s)\n", -ret, dcadec_strerror(ret));
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return AVERROR_EXTERNAL;
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}
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avctx->channels = av_get_channel_layout_nb_channels(channel_mask);
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avctx->channel_layout = channel_mask;
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avctx->sample_rate = sample_rate;
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if (bits_per_sample == 16)
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avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
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else if (bits_per_sample > 16 && bits_per_sample <= 24)
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avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
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else {
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av_log(avctx, AV_LOG_ERROR, "Unsupported number of bits per sample: %d\n",
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bits_per_sample);
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return AVERROR(ENOSYS);
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}
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avctx->bits_per_raw_sample = bits_per_sample;
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switch (profile) {
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case DCADEC_PROFILE_DS:
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avctx->profile = FF_PROFILE_DTS;
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break;
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case DCADEC_PROFILE_DS_96_24:
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avctx->profile = FF_PROFILE_DTS_96_24;
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break;
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case DCADEC_PROFILE_DS_ES:
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avctx->profile = FF_PROFILE_DTS_ES;
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break;
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case DCADEC_PROFILE_HD_HRA:
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avctx->profile = FF_PROFILE_DTS_HD_HRA;
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break;
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case DCADEC_PROFILE_HD_MA:
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avctx->profile = FF_PROFILE_DTS_HD_MA;
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break;
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case DCADEC_PROFILE_EXPRESS:
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avctx->profile = FF_PROFILE_DTS_EXPRESS;
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break;
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case DCADEC_PROFILE_UNKNOWN:
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default:
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avctx->profile = FF_PROFILE_UNKNOWN;
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break;
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}
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/* bitrate is only meaningful if there are no HD extensions, as they distort the bitrate */
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if (profile == DCADEC_PROFILE_DS || profile == DCADEC_PROFILE_DS_96_24 || profile == DCADEC_PROFILE_DS_ES) {
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struct dcadec_core_info *info = dcadec_context_get_core_info(s->ctx);
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avctx->bit_rate = info->bit_rate;
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dcadec_context_free_core_info(info);
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} else
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avctx->bit_rate = 0;
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#if HAVE_STRUCT_DCADEC_EXSS_INFO_MATRIX_ENCODING
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if (exss = dcadec_context_get_exss_info(s->ctx)) {
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enum AVMatrixEncoding matrix_encoding = AV_MATRIX_ENCODING_NONE;
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if (!s->downmix_warned) {
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uint64_t layout = avctx->request_channel_layout;
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if (((layout == AV_CH_LAYOUT_STEREO_DOWNMIX || layout == AV_CH_LAYOUT_STEREO) && !exss->embedded_stereo) ||
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( layout == AV_CH_LAYOUT_5POINT1 && !exss->embedded_6ch))
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av_log(avctx, AV_LOG_WARNING, "%s downmix was requested but no custom coefficients are available, "
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"this may result in clipping\n",
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layout == AV_CH_LAYOUT_5POINT1 ? "5.1" : "Stereo");
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s->downmix_warned = 1;
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}
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switch(exss->matrix_encoding) {
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case DCADEC_MATRIX_ENCODING_SURROUND:
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matrix_encoding = AV_MATRIX_ENCODING_DOLBY;
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break;
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case DCADEC_MATRIX_ENCODING_HEADPHONE:
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matrix_encoding = AV_MATRIX_ENCODING_DOLBYHEADPHONE;
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break;
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}
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dcadec_context_free_exss_info(exss);
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if (matrix_encoding != AV_MATRIX_ENCODING_NONE &&
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(ret = ff_side_data_update_matrix_encoding(frame, matrix_encoding)) < 0)
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return ret;
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}
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#endif
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frame->nb_samples = nsamples;
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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for (i = 0; i < avctx->channels; i++) {
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if (frame->format == AV_SAMPLE_FMT_S16P) {
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int16_t *plane = (int16_t *)frame->extended_data[i];
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for (k = 0; k < nsamples; k++)
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plane[k] = samples[i][k];
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} else {
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int32_t *plane = (int32_t *)frame->extended_data[i];
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int shift = 32 - bits_per_sample;
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for (k = 0; k < nsamples; k++)
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plane[k] = samples[i][k] << shift;
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}
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}
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*got_frame_ptr = 1;
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return avpkt->size;
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}
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static av_cold void dcadec_flush(AVCodecContext *avctx)
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{
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DCADecContext *s = avctx->priv_data;
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dcadec_context_clear(s->ctx);
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}
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static av_cold int dcadec_close(AVCodecContext *avctx)
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{
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DCADecContext *s = avctx->priv_data;
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dcadec_context_destroy(s->ctx);
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s->ctx = NULL;
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av_freep(&s->buffer);
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return 0;
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}
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static av_cold int dcadec_init(AVCodecContext *avctx)
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{
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DCADecContext *s = avctx->priv_data;
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int flags = 0;
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/* Affects only lossy DTS profiles. DTS-HD MA is always bitexact */
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if (avctx->flags & AV_CODEC_FLAG_BITEXACT)
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flags |= DCADEC_FLAG_CORE_BIT_EXACT;
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if (avctx->request_channel_layout > 0 && avctx->request_channel_layout != AV_CH_LAYOUT_NATIVE) {
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switch (avctx->request_channel_layout) {
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case AV_CH_LAYOUT_STEREO:
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case AV_CH_LAYOUT_STEREO_DOWNMIX:
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/* libdcadec ignores the 2ch flag if used alone when no custom downmix coefficients
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are available, silently outputting a 5.1 downmix if possible instead.
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Using both the 2ch and 6ch flags together forces a 2ch downmix using default
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coefficients in such cases. This matches the behavior of the 6ch flag when used
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alone, where a 5.1 downmix is generated if possible, regardless of custom
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coefficients being available or not. */
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flags |= DCADEC_FLAG_KEEP_DMIX_2CH | DCADEC_FLAG_KEEP_DMIX_6CH;
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break;
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case AV_CH_LAYOUT_5POINT1:
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flags |= DCADEC_FLAG_KEEP_DMIX_6CH;
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break;
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default:
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av_log(avctx, AV_LOG_WARNING, "Invalid request_channel_layout\n");
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break;
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}
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}
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s->ctx = dcadec_context_create(flags);
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if (!s->ctx)
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return AVERROR(ENOMEM);
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avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
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avctx->bits_per_raw_sample = 24;
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return 0;
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}
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static const AVProfile profiles[] = {
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{ FF_PROFILE_DTS, "DTS" },
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{ FF_PROFILE_DTS_ES, "DTS-ES" },
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{ FF_PROFILE_DTS_96_24, "DTS 96/24" },
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{ FF_PROFILE_DTS_HD_HRA, "DTS-HD HRA" },
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{ FF_PROFILE_DTS_HD_MA, "DTS-HD MA" },
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{ FF_PROFILE_DTS_EXPRESS, "DTS Express" },
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{ FF_PROFILE_UNKNOWN },
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};
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AVCodec ff_libdcadec_decoder = {
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.name = "libdcadec",
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.long_name = NULL_IF_CONFIG_SMALL("dcadec DCA decoder"),
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.type = AVMEDIA_TYPE_AUDIO,
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.id = AV_CODEC_ID_DTS,
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.priv_data_size = sizeof(DCADecContext),
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.init = dcadec_init,
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.decode = dcadec_decode_frame,
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.close = dcadec_close,
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.flush = dcadec_flush,
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.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
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.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S32P, AV_SAMPLE_FMT_S16P,
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AV_SAMPLE_FMT_NONE },
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.profiles = NULL_IF_CONFIG_SMALL(profiles),
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};
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