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ffmpeg/fftools/ffmpeg_dec.c

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/*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avassert.h"
#include "libavutil/dict.h"
#include "libavutil/error.h"
#include "libavutil/log.h"
#include "libavutil/pixdesc.h"
#include "libavutil/pixfmt.h"
#include "libavutil/timestamp.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/codec.h"
#include "libavfilter/buffersrc.h"
#include "ffmpeg.h"
struct Decoder {
AVFrame *frame;
AVPacket *pkt;
// pts/estimated duration of the last decoded frame
// * in decoder timebase for video,
// * in last_frame_tb (may change during decoding) for audio
int64_t last_frame_pts;
int64_t last_frame_duration_est;
AVRational last_frame_tb;
int64_t last_filter_in_rescale_delta;
int last_frame_sample_rate;
};
void dec_free(Decoder **pdec)
{
Decoder *dec = *pdec;
if (!dec)
return;
av_frame_free(&dec->frame);
av_packet_free(&dec->pkt);
av_freep(pdec);
}
static int dec_alloc(Decoder **pdec)
{
Decoder *dec;
*pdec = NULL;
dec = av_mallocz(sizeof(*dec));
if (!dec)
return AVERROR(ENOMEM);
dec->frame = av_frame_alloc();
if (!dec->frame)
goto fail;
dec->pkt = av_packet_alloc();
if (!dec->pkt)
goto fail;
dec->last_filter_in_rescale_delta = AV_NOPTS_VALUE;
dec->last_frame_pts = AV_NOPTS_VALUE;
dec->last_frame_tb = (AVRational){ 1, 1 };
*pdec = dec;
return 0;
fail:
dec_free(&dec);
return AVERROR(ENOMEM);
}
static int send_frame_to_filters(InputStream *ist, AVFrame *decoded_frame)
{
int i, ret;
av_assert1(ist->nb_filters > 0); /* ensure ret is initialized */
for (i = 0; i < ist->nb_filters; i++) {
ret = ifilter_send_frame(ist->filters[i], decoded_frame, i < ist->nb_filters - 1);
if (ret == AVERROR_EOF)
ret = 0; /* ignore */
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR,
"Failed to inject frame into filter network: %s\n", av_err2str(ret));
break;
}
}
return ret;
}
static AVRational audio_samplerate_update(void *logctx, Decoder *d,
const AVFrame *frame)
{
const int prev = d->last_frame_tb.den;
const int sr = frame->sample_rate;
AVRational tb_new;
int64_t gcd;
if (frame->sample_rate == d->last_frame_sample_rate)
goto finish;
gcd = av_gcd(prev, sr);
if (prev / gcd >= INT_MAX / sr) {
av_log(logctx, AV_LOG_WARNING,
"Audio timestamps cannot be represented exactly after "
"sample rate change: %d -> %d\n", prev, sr);
// LCM of 192000, 44100, allows to represent all common samplerates
tb_new = (AVRational){ 1, 28224000 };
} else
tb_new = (AVRational){ 1, prev / gcd * sr };
// keep the frame timebase if it is strictly better than
// the samplerate-defined one
if (frame->time_base.num == 1 && frame->time_base.den > tb_new.den &&
!(frame->time_base.den % tb_new.den))
tb_new = frame->time_base;
if (d->last_frame_pts != AV_NOPTS_VALUE)
d->last_frame_pts = av_rescale_q(d->last_frame_pts,
d->last_frame_tb, tb_new);
d->last_frame_duration_est = av_rescale_q(d->last_frame_duration_est,
d->last_frame_tb, tb_new);
d->last_frame_tb = tb_new;
d->last_frame_sample_rate = frame->sample_rate;
finish:
return d->last_frame_tb;
}
static void audio_ts_process(void *logctx, Decoder *d, AVFrame *frame)
{
AVRational tb_filter = (AVRational){1, frame->sample_rate};
AVRational tb;
int64_t pts_pred;
// on samplerate change, choose a new internal timebase for timestamp
// generation that can represent timestamps from all the samplerates
// seen so far
tb = audio_samplerate_update(logctx, d, frame);
pts_pred = d->last_frame_pts == AV_NOPTS_VALUE ? 0 :
d->last_frame_pts + d->last_frame_duration_est;
if (frame->pts == AV_NOPTS_VALUE) {
frame->pts = pts_pred;
frame->time_base = tb;
} else if (d->last_frame_pts != AV_NOPTS_VALUE &&
frame->pts > av_rescale_q_rnd(pts_pred, tb, frame->time_base,
AV_ROUND_UP)) {
// there was a gap in timestamps, reset conversion state
d->last_filter_in_rescale_delta = AV_NOPTS_VALUE;
}
frame->pts = av_rescale_delta(frame->time_base, frame->pts,
tb, frame->nb_samples,
&d->last_filter_in_rescale_delta, tb);
d->last_frame_pts = frame->pts;
d->last_frame_duration_est = av_rescale_q(frame->nb_samples,
tb_filter, tb);
// finally convert to filtering timebase
frame->pts = av_rescale_q(frame->pts, tb, tb_filter);
frame->duration = frame->nb_samples;
frame->time_base = tb_filter;
}
static int64_t video_duration_estimate(const InputStream *ist, const AVFrame *frame)
{
const Decoder *d = ist->decoder;
const InputFile *ifile = input_files[ist->file_index];
int64_t codec_duration = 0;
// XXX lavf currently makes up frame durations when they are not provided by
// the container. As there is no way to reliably distinguish real container
// durations from the fake made-up ones, we use heuristics based on whether
// the container has timestamps. Eventually lavf should stop making up
// durations, then this should be simplified.
// prefer frame duration for containers with timestamps
if (frame->duration > 0 && (!ifile->format_nots || ist->framerate.num))
return frame->duration;
if (ist->dec_ctx->framerate.den && ist->dec_ctx->framerate.num) {
int fields = frame->repeat_pict + 2;
AVRational field_rate = av_mul_q(ist->dec_ctx->framerate,
(AVRational){ 2, 1 });
codec_duration = av_rescale_q(fields, av_inv_q(field_rate),
frame->time_base);
}
// prefer codec-layer duration for containers without timestamps
if (codec_duration > 0 && ifile->format_nots)
return codec_duration;
// when timestamps are available, repeat last frame's actual duration
// (i.e. pts difference between this and last frame)
if (frame->pts != AV_NOPTS_VALUE && d->last_frame_pts != AV_NOPTS_VALUE &&
frame->pts > d->last_frame_pts)
return frame->pts - d->last_frame_pts;
// try frame/codec duration
if (frame->duration > 0)
return frame->duration;
if (codec_duration > 0)
return codec_duration;
// try average framerate
if (ist->st->avg_frame_rate.num && ist->st->avg_frame_rate.den) {
int64_t d = av_rescale_q(1, av_inv_q(ist->st->avg_frame_rate),
frame->time_base);
if (d > 0)
return d;
}
// last resort is last frame's estimated duration, and 1
return FFMAX(d->last_frame_duration_est, 1);
}
static int video_frame_process(InputStream *ist, AVFrame *frame)
{
Decoder *d = ist->decoder;
// The following line may be required in some cases where there is no parser
// or the parser does not has_b_frames correctly
if (ist->par->video_delay < ist->dec_ctx->has_b_frames) {
if (ist->dec_ctx->codec_id == AV_CODEC_ID_H264) {
ist->par->video_delay = ist->dec_ctx->has_b_frames;
} else
av_log(ist->dec_ctx, AV_LOG_WARNING,
"video_delay is larger in decoder than demuxer %d > %d.\n"
"If you want to help, upload a sample "
"of this file to https://streams.videolan.org/upload/ "
"and contact the ffmpeg-devel mailing list. (ffmpeg-devel@ffmpeg.org)\n",
ist->dec_ctx->has_b_frames,
ist->par->video_delay);
}
if (ist->dec_ctx->width != frame->width ||
ist->dec_ctx->height != frame->height ||
ist->dec_ctx->pix_fmt != frame->format) {
av_log(NULL, AV_LOG_DEBUG, "Frame parameters mismatch context %d,%d,%d != %d,%d,%d\n",
frame->width,
frame->height,
frame->format,
ist->dec_ctx->width,
ist->dec_ctx->height,
ist->dec_ctx->pix_fmt);
}
if(ist->top_field_first>=0)
frame->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST;
if (ist->hwaccel_retrieve_data && frame->format == ist->hwaccel_pix_fmt) {
int err = ist->hwaccel_retrieve_data(ist->dec_ctx, frame);
if (err < 0)
return err;
}
frame->pts = frame->best_effort_timestamp;
// forced fixed framerate
if (ist->framerate.num) {
frame->pts = AV_NOPTS_VALUE;
frame->duration = 1;
frame->time_base = av_inv_q(ist->framerate);
}
// no timestamp available - extrapolate from previous frame duration
if (frame->pts == AV_NOPTS_VALUE)
frame->pts = d->last_frame_pts == AV_NOPTS_VALUE ? 0 :
d->last_frame_pts + d->last_frame_duration_est;
// update timestamp history
d->last_frame_duration_est = video_duration_estimate(ist, frame);
d->last_frame_pts = frame->pts;
d->last_frame_tb = frame->time_base;
if (debug_ts) {
av_log(ist, AV_LOG_INFO,
"decoder -> pts:%s pts_time:%s "
"pkt_dts:%s pkt_dts_time:%s "
"duration:%s duration_time:%s "
"keyframe:%d frame_type:%d time_base:%d/%d\n",
av_ts2str(frame->pts),
av_ts2timestr(frame->pts, &frame->time_base),
av_ts2str(frame->pkt_dts),
av_ts2timestr(frame->pkt_dts, &frame->time_base),
av_ts2str(frame->duration),
av_ts2timestr(frame->duration, &frame->time_base),
!!(frame->flags & AV_FRAME_FLAG_KEY), frame->pict_type,
frame->time_base.num, frame->time_base.den);
}
if (ist->st->sample_aspect_ratio.num)
frame->sample_aspect_ratio = ist->st->sample_aspect_ratio;
return 0;
}
static void sub2video_flush(InputStream *ist)
{
for (int i = 0; i < ist->nb_filters; i++) {
int ret = ifilter_sub2video(ist->filters[i], NULL);
if (ret != AVERROR_EOF && ret < 0)
av_log(NULL, AV_LOG_WARNING, "Flush the frame error.\n");
}
}
int process_subtitle(InputStream *ist, AVSubtitle *subtitle, int *got_output)
{
int ret = 0;
if (ist->fix_sub_duration) {
int end = 1;
if (ist->prev_sub.got_output) {
end = av_rescale(subtitle->pts - ist->prev_sub.subtitle.pts,
1000, AV_TIME_BASE);
if (end < ist->prev_sub.subtitle.end_display_time) {
av_log(NULL, AV_LOG_DEBUG,
"Subtitle duration reduced from %"PRId32" to %d%s\n",
ist->prev_sub.subtitle.end_display_time, end,
end <= 0 ? ", dropping it" : "");
ist->prev_sub.subtitle.end_display_time = end;
}
}
FFSWAP(int, *got_output, ist->prev_sub.got_output);
FFSWAP(int, ret, ist->prev_sub.ret);
FFSWAP(AVSubtitle, *subtitle, ist->prev_sub.subtitle);
if (end <= 0)
goto out;
}
if (!*got_output)
return ret;
for (int i = 0; i < ist->nb_filters; i++) {
ret = ifilter_sub2video(ist->filters[i], subtitle);
if (ret < 0) {
av_log(ist, AV_LOG_ERROR, "Error sending a subtitle for filtering: %s\n",
av_err2str(ret));
goto out;
}
}
if (!subtitle->num_rects)
goto out;
for (int oidx = 0; oidx < ist->nb_outputs; oidx++) {
OutputStream *ost = ist->outputs[oidx];
if (!ost->enc || ost->type != AVMEDIA_TYPE_SUBTITLE)
continue;
enc_subtitle(output_files[ost->file_index], ost, subtitle);
}
out:
avsubtitle_free(subtitle);
return ret;
}
static int transcode_subtitles(InputStream *ist, const AVPacket *pkt)
{
AVSubtitle subtitle;
int got_output;
int ret = avcodec_decode_subtitle2(ist->dec_ctx,
&subtitle, &got_output, pkt);
if (ret < 0) {
av_log(ist, AV_LOG_ERROR, "Error decoding subtitles: %s\n",
av_err2str(ret));
if (exit_on_error)
exit_program(1);
ist->decode_errors++;
}
if (ret < 0 || !got_output) {
if (!pkt->size)
sub2video_flush(ist);
return ret < 0 ? ret : AVERROR_EOF;
}
ist->frames_decoded++;
return process_subtitle(ist, &subtitle, &got_output);
}
static int send_filter_eof(InputStream *ist)
{
Decoder *d = ist->decoder;
int i, ret;
for (i = 0; i < ist->nb_filters; i++) {
int64_t end_pts = d->last_frame_pts == AV_NOPTS_VALUE ? AV_NOPTS_VALUE :
d->last_frame_pts + d->last_frame_duration_est;
ret = ifilter_send_eof(ist->filters[i], end_pts, d->last_frame_tb);
if (ret < 0)
return ret;
}
return 0;
}
int dec_packet(InputStream *ist, const AVPacket *pkt, int no_eof)
{
Decoder *d = ist->decoder;
AVCodecContext *dec = ist->dec_ctx;
const char *type_desc = av_get_media_type_string(dec->codec_type);
int ret;
if (dec->codec_type == AVMEDIA_TYPE_SUBTITLE)
return transcode_subtitles(ist, pkt ? pkt : d->pkt);
// With fate-indeo3-2, we're getting 0-sized packets before EOF for some
// reason. This seems like a semi-critical bug. Don't trigger EOF, and
// skip the packet.
if (pkt && pkt->size == 0)
return 0;
ret = avcodec_send_packet(dec, pkt);
if (ret < 0 && !(ret == AVERROR_EOF && !pkt)) {
// In particular, we don't expect AVERROR(EAGAIN), because we read all
// decoded frames with avcodec_receive_frame() until done.
if (ret == AVERROR(EAGAIN)) {
av_log(ist, AV_LOG_FATAL, "A decoder returned an unexpected error code. "
"This is a bug, please report it.\n");
exit_program(1);
}
av_log(ist, AV_LOG_ERROR, "Error submitting %s to decoder: %s\n",
pkt ? "packet" : "EOF", av_err2str(ret));
if (exit_on_error)
exit_program(1);
if (ret != AVERROR_EOF)
ist->decode_errors++;
return ret;
}
while (1) {
AVFrame *frame = d->frame;
update_benchmark(NULL);
ret = avcodec_receive_frame(dec, frame);
update_benchmark("decode_%s %d.%d", type_desc,
ist->file_index, ist->index);
if (ret == AVERROR(EAGAIN)) {
av_assert0(pkt); // should never happen during flushing
return 0;
} else if (ret == AVERROR_EOF) {
/* after flushing, send an EOF on all the filter inputs attached to the stream */
/* except when looping we need to flush but not to send an EOF */
if (!no_eof) {
ret = send_filter_eof(ist);
if (ret < 0) {
av_log(NULL, AV_LOG_FATAL, "Error marking filters as finished\n");
exit_program(1);
}
}
return AVERROR_EOF;
} else if (ret < 0) {
av_log(ist, AV_LOG_ERROR, "Decoding error: %s\n", av_err2str(ret));
if (exit_on_error)
exit_program(1);
ist->decode_errors++;
return ret;
}
if (frame->decode_error_flags || (frame->flags & AV_FRAME_FLAG_CORRUPT)) {
av_log(ist, exit_on_error ? AV_LOG_FATAL : AV_LOG_WARNING,
"corrupt decoded frame\n");
if (exit_on_error)
exit_program(1);
}
if (ist->want_frame_data) {
FrameData *fd;
av_assert0(!frame->opaque_ref);
fd = frame_data(frame);
if (!fd) {
av_frame_unref(frame);
report_and_exit(AVERROR(ENOMEM));
}
fd->pts = frame->pts;
fd->tb = dec->pkt_timebase;
fd->idx = dec->frame_num - 1;
}
frame->time_base = dec->pkt_timebase;
if (dec->codec_type == AVMEDIA_TYPE_AUDIO) {
ist->samples_decoded += frame->nb_samples;
ist->nb_samples = frame->nb_samples;
audio_ts_process(ist, ist->decoder, frame);
} else {
ret = video_frame_process(ist, frame);
if (ret < 0) {
av_log(NULL, AV_LOG_FATAL, "Error while processing the decoded "
"data for stream #%d:%d\n", ist->file_index, ist->index);
exit_program(1);
}
}
ist->frames_decoded++;
ret = send_frame_to_filters(ist, frame);
av_frame_unref(frame);
if (ret < 0)
exit_program(1);
}
}
static enum AVPixelFormat get_format(AVCodecContext *s, const enum AVPixelFormat *pix_fmts)
{
InputStream *ist = s->opaque;
const enum AVPixelFormat *p;
int ret;
for (p = pix_fmts; *p != AV_PIX_FMT_NONE; p++) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(*p);
const AVCodecHWConfig *config = NULL;
int i;
if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
break;
if (ist->hwaccel_id == HWACCEL_GENERIC ||
ist->hwaccel_id == HWACCEL_AUTO) {
for (i = 0;; i++) {
config = avcodec_get_hw_config(s->codec, i);
if (!config)
break;
if (!(config->methods &
AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX))
continue;
if (config->pix_fmt == *p)
break;
}
}
if (config && config->device_type == ist->hwaccel_device_type) {
ret = hwaccel_decode_init(s);
if (ret < 0) {
if (ist->hwaccel_id == HWACCEL_GENERIC) {
av_log(NULL, AV_LOG_FATAL,
"%s hwaccel requested for input stream #%d:%d, "
"but cannot be initialized.\n",
av_hwdevice_get_type_name(config->device_type),
ist->file_index, ist->index);
return AV_PIX_FMT_NONE;
}
continue;
}
ist->hwaccel_pix_fmt = *p;
break;
}
}
return *p;
}
static HWDevice *hw_device_match_by_codec(const AVCodec *codec)
{
const AVCodecHWConfig *config;
HWDevice *dev;
int i;
for (i = 0;; i++) {
config = avcodec_get_hw_config(codec, i);
if (!config)
return NULL;
if (!(config->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX))
continue;
dev = hw_device_get_by_type(config->device_type);
if (dev)
return dev;
}
}
static int hw_device_setup_for_decode(InputStream *ist)
{
const AVCodecHWConfig *config;
enum AVHWDeviceType type;
HWDevice *dev = NULL;
int err, auto_device = 0;
if (ist->hwaccel_device) {
dev = hw_device_get_by_name(ist->hwaccel_device);
if (!dev) {
if (ist->hwaccel_id == HWACCEL_AUTO) {
auto_device = 1;
} else if (ist->hwaccel_id == HWACCEL_GENERIC) {
type = ist->hwaccel_device_type;
err = hw_device_init_from_type(type, ist->hwaccel_device,
&dev);
} else {
// This will be dealt with by API-specific initialisation
// (using hwaccel_device), so nothing further needed here.
return 0;
}
} else {
if (ist->hwaccel_id == HWACCEL_AUTO) {
ist->hwaccel_device_type = dev->type;
} else if (ist->hwaccel_device_type != dev->type) {
av_log(NULL, AV_LOG_ERROR, "Invalid hwaccel device "
"specified for decoder: device %s of type %s is not "
"usable with hwaccel %s.\n", dev->name,
av_hwdevice_get_type_name(dev->type),
av_hwdevice_get_type_name(ist->hwaccel_device_type));
return AVERROR(EINVAL);
}
}
} else {
if (ist->hwaccel_id == HWACCEL_AUTO) {
auto_device = 1;
} else if (ist->hwaccel_id == HWACCEL_GENERIC) {
type = ist->hwaccel_device_type;
dev = hw_device_get_by_type(type);
// When "-qsv_device device" is used, an internal QSV device named
// as "__qsv_device" is created. Another QSV device is created too
// if "-init_hw_device qsv=name:device" is used. There are 2 QSV devices
// if both "-qsv_device device" and "-init_hw_device qsv=name:device"
// are used, hw_device_get_by_type(AV_HWDEVICE_TYPE_QSV) returns NULL.
// To keep back-compatibility with the removed ad-hoc libmfx setup code,
// call hw_device_get_by_name("__qsv_device") to select the internal QSV
// device.
if (!dev && type == AV_HWDEVICE_TYPE_QSV)
dev = hw_device_get_by_name("__qsv_device");
if (!dev)
err = hw_device_init_from_type(type, NULL, &dev);
} else {
dev = hw_device_match_by_codec(ist->dec);
if (!dev) {
// No device for this codec, but not using generic hwaccel
// and therefore may well not need one - ignore.
return 0;
}
}
}
if (auto_device) {
int i;
if (!avcodec_get_hw_config(ist->dec, 0)) {
// Decoder does not support any hardware devices.
return 0;
}
for (i = 0; !dev; i++) {
config = avcodec_get_hw_config(ist->dec, i);
if (!config)
break;
type = config->device_type;
dev = hw_device_get_by_type(type);
if (dev) {
av_log(NULL, AV_LOG_INFO, "Using auto "
"hwaccel type %s with existing device %s.\n",
av_hwdevice_get_type_name(type), dev->name);
}
}
for (i = 0; !dev; i++) {
config = avcodec_get_hw_config(ist->dec, i);
if (!config)
break;
type = config->device_type;
// Try to make a new device of this type.
err = hw_device_init_from_type(type, ist->hwaccel_device,
&dev);
if (err < 0) {
// Can't make a device of this type.
continue;
}
if (ist->hwaccel_device) {
av_log(NULL, AV_LOG_INFO, "Using auto "
"hwaccel type %s with new device created "
"from %s.\n", av_hwdevice_get_type_name(type),
ist->hwaccel_device);
} else {
av_log(NULL, AV_LOG_INFO, "Using auto "
"hwaccel type %s with new default device.\n",
av_hwdevice_get_type_name(type));
}
}
if (dev) {
ist->hwaccel_device_type = type;
} else {
av_log(NULL, AV_LOG_INFO, "Auto hwaccel "
"disabled: no device found.\n");
ist->hwaccel_id = HWACCEL_NONE;
return 0;
}
}
if (!dev) {
av_log(NULL, AV_LOG_ERROR, "No device available "
"for decoder: device type %s needed for codec %s.\n",
av_hwdevice_get_type_name(type), ist->dec->name);
return err;
}
ist->dec_ctx->hw_device_ctx = av_buffer_ref(dev->device_ref);
if (!ist->dec_ctx->hw_device_ctx)
return AVERROR(ENOMEM);
return 0;
}
int dec_open(InputStream *ist)
{
const AVCodec *codec = ist->dec;
int ret;
if (!codec) {
av_log(ist, AV_LOG_ERROR,
"Decoding requested, but no decoder found for: %s\n",
avcodec_get_name(ist->dec_ctx->codec_id));
return AVERROR(EINVAL);
}
ret = dec_alloc(&ist->decoder);
if (ret < 0)
return ret;
ist->dec_ctx->opaque = ist;
ist->dec_ctx->get_format = get_format;
if (ist->dec_ctx->codec_id == AV_CODEC_ID_DVB_SUBTITLE &&
(ist->decoding_needed & DECODING_FOR_OST)) {
av_dict_set(&ist->decoder_opts, "compute_edt", "1", AV_DICT_DONT_OVERWRITE);
if (ist->decoding_needed & DECODING_FOR_FILTER)
av_log(NULL, AV_LOG_WARNING, "Warning using DVB subtitles for filtering and output at the same time is not fully supported, also see -compute_edt [0|1]\n");
}
/* Useful for subtitles retiming by lavf (FIXME), skipping samples in
* audio, and video decoders such as cuvid or mediacodec */
ist->dec_ctx->pkt_timebase = ist->st->time_base;
if (!av_dict_get(ist->decoder_opts, "threads", NULL, 0))
av_dict_set(&ist->decoder_opts, "threads", "auto", 0);
/* Attached pics are sparse, therefore we would not want to delay their decoding till EOF. */
if (ist->st->disposition & AV_DISPOSITION_ATTACHED_PIC)
av_dict_set(&ist->decoder_opts, "threads", "1", 0);
ret = hw_device_setup_for_decode(ist);
if (ret < 0) {
av_log(ist, AV_LOG_ERROR,
"Hardware device setup failed for decoder: %s\n",
av_err2str(ret));
return ret;
}
if ((ret = avcodec_open2(ist->dec_ctx, codec, &ist->decoder_opts)) < 0) {
if (ret == AVERROR_EXPERIMENTAL)
exit_program(1);
av_log(ist, AV_LOG_ERROR, "Error while opening decoder: %s\n",
av_err2str(ret));
return ret;
}
assert_avoptions(ist->decoder_opts);
return 0;
}
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