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1d9aac9c4b
FFmpeg/fftools/ffmpeg_demux.c
Gyan Doshi 5ccd4d3060 ffmpeg: fix implementation of updated input start time 
The current adjustment of input start times just adjusts the tsoffset.
And it does so, by resetting the tsoffset to nullify the new start time.
This leads to breakage of -copyts, ignoring of input_ts_offset, breaking
of -isync as well as breaking wrap correction.

Fixed by taking cognizance of these parameters, and by correcting start times
just before sync offsets are applied.
2022-11-03 14:38:42 +05:30

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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 <float.h>
#include <stdint.h>
#include "ffmpeg.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/display.h"
#include "libavutil/error.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/time.h"
#include "libavutil/timestamp.h"
#include "libavutil/thread.h"
#include "libavutil/threadmessage.h"
#include "libavcodec/packet.h"
#include "libavformat/avformat.h"
static const char *const opt_name_discard[] = {"discard", NULL};
static const char *const opt_name_reinit_filters[] = {"reinit_filter", NULL};
static const char *const opt_name_fix_sub_duration[] = {"fix_sub_duration", NULL};
static const char *const opt_name_canvas_sizes[] = {"canvas_size", NULL};
static const char *const opt_name_guess_layout_max[] = {"guess_layout_max", NULL};
static const char *const opt_name_ts_scale[] = {"itsscale", NULL};
static const char *const opt_name_hwaccels[] = {"hwaccel", NULL};
static const char *const opt_name_hwaccel_devices[] = {"hwaccel_device", NULL};
static const char *const opt_name_hwaccel_output_formats[] = {"hwaccel_output_format", NULL};
static const char *const opt_name_autorotate[] = {"autorotate", NULL};
static const char *const opt_name_display_rotations[] = {"display_rotation", NULL};
static const char *const opt_name_display_hflips[] = {"display_hflip", NULL};
static const char *const opt_name_display_vflips[] = {"display_vflip", NULL};
typedef struct Demuxer {
InputFile f;
/* number of times input stream should be looped */
int loop;
/* actual duration of the longest stream in a file at the moment when
* looping happens */
int64_t duration;
/* time base of the duration */
AVRational time_base;
/* number of streams that the user was warned of */
int nb_streams_warn;
AVThreadMessageQueue *in_thread_queue;
int thread_queue_size;
pthread_t thread;
int non_blocking;
} Demuxer;
typedef struct DemuxMsg {
AVPacket *pkt;
int looping;
// repeat_pict from the demuxer-internal parser
int repeat_pict;
} DemuxMsg;
static Demuxer *demuxer_from_ifile(InputFile *f)
{
return (Demuxer*)f;
}
static void report_new_stream(Demuxer *d, const AVPacket *pkt)
{
AVStream *st = d->f.ctx->streams[pkt->stream_index];
if (pkt->stream_index < d->nb_streams_warn)
return;
av_log(NULL, AV_LOG_WARNING,
"New %s stream %d:%d at pos:%"PRId64" and DTS:%ss\n",
av_get_media_type_string(st->codecpar->codec_type),
d->f.index, pkt->stream_index,
pkt->pos, av_ts2timestr(pkt->dts, &st->time_base));
d->nb_streams_warn = pkt->stream_index + 1;
}
static void ifile_duration_update(Demuxer *d, InputStream *ist,
int64_t last_duration)
{
/* the total duration of the stream, max_pts - min_pts is
* the duration of the stream without the last frame */
if (ist->max_pts > ist->min_pts &&
ist->max_pts - (uint64_t)ist->min_pts < INT64_MAX - last_duration)
last_duration += ist->max_pts - ist->min_pts;
if (!d->duration ||
av_compare_ts(d->duration, d->time_base,
last_duration, ist->st->time_base) < 0) {
d->duration = last_duration;
d->time_base = ist->st->time_base;
}
}
static int seek_to_start(Demuxer *d)
{
InputFile *ifile = &d->f;
AVFormatContext *is = ifile->ctx;
InputStream *ist;
int ret;
ret = avformat_seek_file(is, -1, INT64_MIN, is->start_time, is->start_time, 0);
if (ret < 0)
return ret;
if (ifile->audio_duration_queue_size) {
/* duration is the length of the last frame in a stream
* when audio stream is present we don't care about
* last video frame length because it's not defined exactly */
int got_durations = 0;
while (got_durations < ifile->audio_duration_queue_size) {
LastFrameDuration dur;
ret = av_thread_message_queue_recv(ifile->audio_duration_queue, &dur, 0);
if (ret < 0)
return ret;
got_durations++;
ist = input_streams[ifile->ist_index + dur.stream_idx];
ifile_duration_update(d, ist, dur.duration);
}
} else {
for (int i = 0; i < ifile->nb_streams; i++) {
int64_t duration = 0;
ist = input_streams[ifile->ist_index + i];
if (ist->framerate.num) {
duration = av_rescale_q(1, av_inv_q(ist->framerate), ist->st->time_base);
} else if (ist->st->avg_frame_rate.num) {
duration = av_rescale_q(1, av_inv_q(ist->st->avg_frame_rate), ist->st->time_base);
} else {
duration = 1;
}
ifile_duration_update(d, ist, duration);
}
}
if (d->loop > 0)
d->loop--;
return ret;
}
static void ts_fixup(Demuxer *d, AVPacket *pkt, int *repeat_pict)
{
InputFile *ifile = &d->f;
InputStream *ist = input_streams[ifile->ist_index + pkt->stream_index];
const int64_t start_time = ifile->start_time_effective;
int64_t duration;
if (debug_ts) {
av_log(NULL, AV_LOG_INFO, "demuxer -> ist_index:%d type:%s "
"pkt_pts:%s pkt_pts_time:%s pkt_dts:%s pkt_dts_time:%s duration:%s duration_time:%s\n",
ifile->ist_index + pkt->stream_index,
av_get_media_type_string(ist->st->codecpar->codec_type),
av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &ist->st->time_base),
av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &ist->st->time_base),
av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, &ist->st->time_base));
}
if (!ist->wrap_correction_done && start_time != AV_NOPTS_VALUE &&
ist->st->pts_wrap_bits < 64) {
int64_t stime, stime2;
stime = av_rescale_q(start_time, AV_TIME_BASE_Q, ist->st->time_base);
stime2= stime + (1ULL<<ist->st->pts_wrap_bits);
ist->wrap_correction_done = 1;
if(stime2 > stime && pkt->dts != AV_NOPTS_VALUE && pkt->dts > stime + (1LL<<(ist->st->pts_wrap_bits-1))) {
pkt->dts -= 1ULL<<ist->st->pts_wrap_bits;
ist->wrap_correction_done = 0;
}
if(stime2 > stime && pkt->pts != AV_NOPTS_VALUE && pkt->pts > stime + (1LL<<(ist->st->pts_wrap_bits-1))) {
pkt->pts -= 1ULL<<ist->st->pts_wrap_bits;
ist->wrap_correction_done = 0;
}
}
if (pkt->dts != AV_NOPTS_VALUE)
pkt->dts += av_rescale_q(ifile->ts_offset, AV_TIME_BASE_Q, ist->st->time_base);
if (pkt->pts != AV_NOPTS_VALUE)
pkt->pts += av_rescale_q(ifile->ts_offset, AV_TIME_BASE_Q, ist->st->time_base);
if (pkt->pts != AV_NOPTS_VALUE)
pkt->pts *= ist->ts_scale;
if (pkt->dts != AV_NOPTS_VALUE)
pkt->dts *= ist->ts_scale;
duration = av_rescale_q(d->duration, d->time_base, ist->st->time_base);
if (pkt->pts != AV_NOPTS_VALUE) {
pkt->pts += duration;
ist->max_pts = FFMAX(pkt->pts, ist->max_pts);
ist->min_pts = FFMIN(pkt->pts, ist->min_pts);
}
if (pkt->dts != AV_NOPTS_VALUE)
pkt->dts += duration;
*repeat_pict = -1;
if (ist->st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
av_stream_get_parser(ist->st))
*repeat_pict = av_stream_get_parser(ist->st)->repeat_pict;
}
static void thread_set_name(InputFile *f)
{
char name[16];
snprintf(name, sizeof(name), "dmx%d:%s", f->index, f->ctx->iformat->name);
ff_thread_setname(name);
}
static void *input_thread(void *arg)
{
Demuxer *d = arg;
InputFile *f = &d->f;
AVPacket *pkt;
unsigned flags = d->non_blocking ? AV_THREAD_MESSAGE_NONBLOCK : 0;
int ret = 0;
pkt = av_packet_alloc();
if (!pkt) {
ret = AVERROR(ENOMEM);
goto finish;
}
thread_set_name(f);
while (1) {
DemuxMsg msg = { NULL };
ret = av_read_frame(f->ctx, pkt);
if (ret == AVERROR(EAGAIN)) {
av_usleep(10000);
continue;
}
if (ret < 0) {
if (d->loop) {
/* signal looping to the consumer thread */
msg.looping = 1;
ret = av_thread_message_queue_send(d->in_thread_queue, &msg, 0);
if (ret >= 0)
ret = seek_to_start(d);
if (ret >= 0)
continue;
/* fallthrough to the error path */
}
if (ret == AVERROR_EOF)
av_log(NULL, AV_LOG_VERBOSE, "EOF in input file %d\n", f->index);
else
av_log(NULL, AV_LOG_ERROR, "Error demuxing input file %d: %s\n",
f->index, av_err2str(ret));
break;
}
if (do_pkt_dump) {
av_pkt_dump_log2(NULL, AV_LOG_INFO, pkt, do_hex_dump,
f->ctx->streams[pkt->stream_index]);
}
/* the following test is needed in case new streams appear
dynamically in stream : we ignore them */
if (pkt->stream_index >= f->nb_streams) {
report_new_stream(d, pkt);
av_packet_unref(pkt);
continue;
}
if (pkt->flags & AV_PKT_FLAG_CORRUPT) {
av_log(NULL, exit_on_error ? AV_LOG_FATAL : AV_LOG_WARNING,
"%s: corrupt input packet in stream %d\n",
f->ctx->url, pkt->stream_index);
if (exit_on_error) {
av_packet_unref(pkt);
ret = AVERROR_INVALIDDATA;
break;
}
}
ts_fixup(d, pkt, &msg.repeat_pict);
msg.pkt = av_packet_alloc();
if (!msg.pkt) {
av_packet_unref(pkt);
ret = AVERROR(ENOMEM);
break;
}
av_packet_move_ref(msg.pkt, pkt);
ret = av_thread_message_queue_send(d->in_thread_queue, &msg, flags);
if (flags && ret == AVERROR(EAGAIN)) {
flags = 0;
ret = av_thread_message_queue_send(d->in_thread_queue, &msg, flags);
av_log(f->ctx, AV_LOG_WARNING,
"Thread message queue blocking; consider raising the "
"thread_queue_size option (current value: %d)\n",
d->thread_queue_size);
}
if (ret < 0) {
if (ret != AVERROR_EOF)
av_log(f->ctx, AV_LOG_ERROR,
"Unable to send packet to main thread: %s\n",
av_err2str(ret));
av_packet_free(&msg.pkt);
break;
}
}
finish:
av_assert0(ret < 0);
av_thread_message_queue_set_err_recv(d->in_thread_queue, ret);
av_packet_free(&pkt);
av_log(NULL, AV_LOG_VERBOSE, "Terminating demuxer thread %d\n", f->index);
return NULL;
}
static void thread_stop(Demuxer *d)
{
InputFile *f = &d->f;
DemuxMsg msg;
if (!d->in_thread_queue)
return;
av_thread_message_queue_set_err_send(d->in_thread_queue, AVERROR_EOF);
while (av_thread_message_queue_recv(d->in_thread_queue, &msg, 0) >= 0)
av_packet_free(&msg.pkt);
pthread_join(d->thread, NULL);
av_thread_message_queue_free(&d->in_thread_queue);
av_thread_message_queue_free(&f->audio_duration_queue);
}
static int thread_start(Demuxer *d)
{
int ret;
InputFile *f = &d->f;
if (d->thread_queue_size <= 0)
d->thread_queue_size = (nb_input_files > 1 ? 8 : 1);
if (f->ctx->pb ? !f->ctx->pb->seekable :
strcmp(f->ctx->iformat->name, "lavfi"))
d->non_blocking = 1;
ret = av_thread_message_queue_alloc(&d->in_thread_queue,
d->thread_queue_size, sizeof(DemuxMsg));
if (ret < 0)
return ret;
if (d->loop) {
int nb_audio_dec = 0;
for (int i = 0; i < f->nb_streams; i++) {
InputStream *ist = input_streams[f->ist_index + i];
nb_audio_dec += !!(ist->decoding_needed &&
ist->st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO);
}
if (nb_audio_dec) {
ret = av_thread_message_queue_alloc(&f->audio_duration_queue,
nb_audio_dec, sizeof(LastFrameDuration));
if (ret < 0)
goto fail;
f->audio_duration_queue_size = nb_audio_dec;
}
}
if ((ret = pthread_create(&d->thread, NULL, input_thread, d))) {
av_log(NULL, AV_LOG_ERROR, "pthread_create failed: %s. Try to increase `ulimit -v` or decrease `ulimit -s`.\n", strerror(ret));
ret = AVERROR(ret);
goto fail;
}
return 0;
fail:
av_thread_message_queue_free(&d->in_thread_queue);
return ret;
}
int ifile_get_packet(InputFile *f, AVPacket **pkt)
{
Demuxer *d = demuxer_from_ifile(f);
InputStream *ist;
DemuxMsg msg;
int ret;
if (!d->in_thread_queue) {
ret = thread_start(d);
if (ret < 0)
return ret;
}
if (f->readrate || f->rate_emu) {
int i;
int64_t file_start = copy_ts * (
(f->start_time_effective != AV_NOPTS_VALUE ? f->start_time_effective * !start_at_zero : 0) +
(f->start_time != AV_NOPTS_VALUE ? f->start_time : 0)
);
float scale = f->rate_emu ? 1.0 : f->readrate;
for (i = 0; i < f->nb_streams; i++) {
InputStream *ist = input_streams[f->ist_index + i];
int64_t stream_ts_offset, pts, now;
if (!ist->nb_packets || (ist->decoding_needed && !ist->got_output)) continue;
stream_ts_offset = FFMAX(ist->first_dts != AV_NOPTS_VALUE ? ist->first_dts : 0, file_start);
pts = av_rescale(ist->dts, 1000000, AV_TIME_BASE);
now = (av_gettime_relative() - ist->start) * scale + stream_ts_offset;
if (pts > now)
return AVERROR(EAGAIN);
}
}
ret = av_thread_message_queue_recv(d->in_thread_queue, &msg,
d->non_blocking ?
AV_THREAD_MESSAGE_NONBLOCK : 0);
if (ret < 0)
return ret;
if (msg.looping)
return 1;
ist = input_streams[f->ist_index + msg.pkt->stream_index];
ist->last_pkt_repeat_pict = msg.repeat_pict;
*pkt = msg.pkt;
return 0;
}
void ifile_close(InputFile **pf)
{
InputFile *f = *pf;
Demuxer *d = demuxer_from_ifile(f);
if (!f)
return;
thread_stop(d);
avformat_close_input(&f->ctx);
av_freep(pf);
}
static const AVCodec *choose_decoder(OptionsContext *o, AVFormatContext *s, AVStream *st,
enum HWAccelID hwaccel_id, enum AVHWDeviceType hwaccel_device_type)
{
char *codec_name = NULL;
MATCH_PER_STREAM_OPT(codec_names, str, codec_name, s, st);
if (codec_name) {
const AVCodec *codec = find_codec_or_die(codec_name, st->codecpar->codec_type, 0);
st->codecpar->codec_id = codec->id;
if (recast_media && st->codecpar->codec_type != codec->type)
st->codecpar->codec_type = codec->type;
return codec;
} else {
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
hwaccel_id == HWACCEL_GENERIC &&
hwaccel_device_type != AV_HWDEVICE_TYPE_NONE) {
const AVCodec *c;
void *i = NULL;
while ((c = av_codec_iterate(&i))) {
const AVCodecHWConfig *config;
if (c->id != st->codecpar->codec_id ||
!av_codec_is_decoder(c))
continue;
for (int j = 0; config = avcodec_get_hw_config(c, j); j++) {
if (config->device_type == hwaccel_device_type) {
av_log(NULL, AV_LOG_VERBOSE, "Selecting decoder '%s' because of requested hwaccel method %s\n",
c->name, av_hwdevice_get_type_name(hwaccel_device_type));
return c;
}
}
}
}
return avcodec_find_decoder(st->codecpar->codec_id);
}
}
static int guess_input_channel_layout(InputStream *ist)
{
AVCodecContext *dec = ist->dec_ctx;
if (dec->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC) {
char layout_name[256];
if (dec->ch_layout.nb_channels > ist->guess_layout_max)
return 0;
av_channel_layout_default(&dec->ch_layout, dec->ch_layout.nb_channels);
if (dec->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC)
return 0;
av_channel_layout_describe(&dec->ch_layout, layout_name, sizeof(layout_name));
av_log(NULL, AV_LOG_WARNING, "Guessed Channel Layout for Input Stream "
"#%d.%d : %s\n", ist->file_index, ist->st->index, layout_name);
}
return 1;
}
static void add_display_matrix_to_stream(OptionsContext *o,
AVFormatContext *ctx, AVStream *st)
{
double rotation = DBL_MAX;
int hflip = -1, vflip = -1;
int hflip_set = 0, vflip_set = 0, rotation_set = 0;
int32_t *buf;
MATCH_PER_STREAM_OPT(display_rotations, dbl, rotation, ctx, st);
MATCH_PER_STREAM_OPT(display_hflips, i, hflip, ctx, st);
MATCH_PER_STREAM_OPT(display_vflips, i, vflip, ctx, st);
rotation_set = rotation != DBL_MAX;
hflip_set = hflip != -1;
vflip_set = vflip != -1;
if (!rotation_set && !hflip_set && !vflip_set)
return;
buf = (int32_t *)av_stream_new_side_data(st, AV_PKT_DATA_DISPLAYMATRIX, sizeof(int32_t) * 9);
if (!buf) {
av_log(NULL, AV_LOG_FATAL, "Failed to generate a display matrix!\n");
exit_program(1);
}
av_display_rotation_set(buf,
rotation_set ? -(rotation) : -0.0f);
av_display_matrix_flip(buf,
hflip_set ? hflip : 0,
vflip_set ? vflip : 0);
}
/* Add all the streams from the given input file to the global
* list of input streams. */
static void add_input_streams(OptionsContext *o, AVFormatContext *ic)
{
int i, ret;
for (i = 0; i < ic->nb_streams; i++) {
AVStream *st = ic->streams[i];
AVCodecParameters *par = st->codecpar;
InputStream *ist;
char *framerate = NULL, *hwaccel_device = NULL;
const char *hwaccel = NULL;
char *hwaccel_output_format = NULL;
char *codec_tag = NULL;
char *next;
char *discard_str = NULL;
const AVClass *cc = avcodec_get_class();
const AVOption *discard_opt = av_opt_find(&cc, "skip_frame", NULL,
0, AV_OPT_SEARCH_FAKE_OBJ);
ist = ALLOC_ARRAY_ELEM(input_streams, nb_input_streams);
ist->st = st;
ist->file_index = nb_input_files;
ist->discard = 1;
st->discard = AVDISCARD_ALL;
ist->nb_samples = 0;
ist->first_dts = AV_NOPTS_VALUE;
ist->min_pts = INT64_MAX;
ist->max_pts = INT64_MIN;
ist->ts_scale = 1.0;
MATCH_PER_STREAM_OPT(ts_scale, dbl, ist->ts_scale, ic, st);
ist->autorotate = 1;
MATCH_PER_STREAM_OPT(autorotate, i, ist->autorotate, ic, st);
MATCH_PER_STREAM_OPT(codec_tags, str, codec_tag, ic, st);
if (codec_tag) {
uint32_t tag = strtol(codec_tag, &next, 0);
if (*next)
tag = AV_RL32(codec_tag);
st->codecpar->codec_tag = tag;
}
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
add_display_matrix_to_stream(o, ic, st);
MATCH_PER_STREAM_OPT(hwaccels, str, hwaccel, ic, st);
MATCH_PER_STREAM_OPT(hwaccel_output_formats, str,
hwaccel_output_format, ic, st);
if (!hwaccel_output_format && hwaccel && !strcmp(hwaccel, "cuvid")) {
av_log(NULL, AV_LOG_WARNING,
"WARNING: defaulting hwaccel_output_format to cuda for compatibility "
"with old commandlines. This behaviour is DEPRECATED and will be removed "
"in the future. Please explicitly set \"-hwaccel_output_format cuda\".\n");
ist->hwaccel_output_format = AV_PIX_FMT_CUDA;
} else if (!hwaccel_output_format && hwaccel && !strcmp(hwaccel, "qsv")) {
av_log(NULL, AV_LOG_WARNING,
"WARNING: defaulting hwaccel_output_format to qsv for compatibility "
"with old commandlines. This behaviour is DEPRECATED and will be removed "
"in the future. Please explicitly set \"-hwaccel_output_format qsv\".\n");
ist->hwaccel_output_format = AV_PIX_FMT_QSV;
} else if (hwaccel_output_format) {
ist->hwaccel_output_format = av_get_pix_fmt(hwaccel_output_format);
if (ist->hwaccel_output_format == AV_PIX_FMT_NONE) {
av_log(NULL, AV_LOG_FATAL, "Unrecognised hwaccel output "
"format: %s", hwaccel_output_format);
}
} else {
ist->hwaccel_output_format = AV_PIX_FMT_NONE;
}
if (hwaccel) {
// The NVDEC hwaccels use a CUDA device, so remap the name here.
if (!strcmp(hwaccel, "nvdec") || !strcmp(hwaccel, "cuvid"))
hwaccel = "cuda";
if (!strcmp(hwaccel, "none"))
ist->hwaccel_id = HWACCEL_NONE;
else if (!strcmp(hwaccel, "auto"))
ist->hwaccel_id = HWACCEL_AUTO;
else {
enum AVHWDeviceType type = av_hwdevice_find_type_by_name(hwaccel);
if (type != AV_HWDEVICE_TYPE_NONE) {
ist->hwaccel_id = HWACCEL_GENERIC;
ist->hwaccel_device_type = type;
}
if (!ist->hwaccel_id) {
av_log(NULL, AV_LOG_FATAL, "Unrecognized hwaccel: %s.\n",
hwaccel);
av_log(NULL, AV_LOG_FATAL, "Supported hwaccels: ");
type = AV_HWDEVICE_TYPE_NONE;
while ((type = av_hwdevice_iterate_types(type)) !=
AV_HWDEVICE_TYPE_NONE)
av_log(NULL, AV_LOG_FATAL, "%s ",
av_hwdevice_get_type_name(type));
av_log(NULL, AV_LOG_FATAL, "\n");
exit_program(1);
}
}
}
MATCH_PER_STREAM_OPT(hwaccel_devices, str, hwaccel_device, ic, st);
if (hwaccel_device) {
ist->hwaccel_device = av_strdup(hwaccel_device);
if (!ist->hwaccel_device)
report_and_exit(AVERROR(ENOMEM));
}
ist->hwaccel_pix_fmt = AV_PIX_FMT_NONE;
}
ist->dec = choose_decoder(o, ic, st, ist->hwaccel_id, ist->hwaccel_device_type);
ist->decoder_opts = filter_codec_opts(o->g->codec_opts, ist->st->codecpar->codec_id, ic, st, ist->dec);
ist->reinit_filters = -1;
MATCH_PER_STREAM_OPT(reinit_filters, i, ist->reinit_filters, ic, st);
MATCH_PER_STREAM_OPT(discard, str, discard_str, ic, st);
ist->user_set_discard = AVDISCARD_NONE;
if ((o->video_disable && ist->st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) ||
(o->audio_disable && ist->st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) ||
(o->subtitle_disable && ist->st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE) ||
(o->data_disable && ist->st->codecpar->codec_type == AVMEDIA_TYPE_DATA))
ist->user_set_discard = AVDISCARD_ALL;
if (discard_str && av_opt_eval_int(&cc, discard_opt, discard_str, &ist->user_set_discard) < 0) {
av_log(NULL, AV_LOG_ERROR, "Error parsing discard %s.\n",
discard_str);
exit_program(1);
}
ist->filter_in_rescale_delta_last = AV_NOPTS_VALUE;
ist->prev_pkt_pts = AV_NOPTS_VALUE;
ist->dec_ctx = avcodec_alloc_context3(ist->dec);
if (!ist->dec_ctx)
report_and_exit(AVERROR(ENOMEM));
ret = avcodec_parameters_to_context(ist->dec_ctx, par);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Error initializing the decoder context.\n");
exit_program(1);
}
ist->decoded_frame = av_frame_alloc();
if (!ist->decoded_frame)
report_and_exit(AVERROR(ENOMEM));
ist->pkt = av_packet_alloc();
if (!ist->pkt)
report_and_exit(AVERROR(ENOMEM));
if (o->bitexact)
ist->dec_ctx->flags |= AV_CODEC_FLAG_BITEXACT;
switch (par->codec_type) {
case AVMEDIA_TYPE_VIDEO:
// avformat_find_stream_info() doesn't set this for us anymore.
ist->dec_ctx->framerate = st->avg_frame_rate;
MATCH_PER_STREAM_OPT(frame_rates, str, framerate, ic, st);
if (framerate && av_parse_video_rate(&ist->framerate,
framerate) < 0) {
av_log(NULL, AV_LOG_ERROR, "Error parsing framerate %s.\n",
framerate);
exit_program(1);
}
ist->top_field_first = -1;
MATCH_PER_STREAM_OPT(top_field_first, i, ist->top_field_first, ic, st);
ist->framerate_guessed = av_guess_frame_rate(ic, st, NULL);
break;
case AVMEDIA_TYPE_AUDIO:
ist->guess_layout_max = INT_MAX;
MATCH_PER_STREAM_OPT(guess_layout_max, i, ist->guess_layout_max, ic, st);
guess_input_channel_layout(ist);
break;
case AVMEDIA_TYPE_DATA:
case AVMEDIA_TYPE_SUBTITLE: {
char *canvas_size = NULL;
MATCH_PER_STREAM_OPT(fix_sub_duration, i, ist->fix_sub_duration, ic, st);
MATCH_PER_STREAM_OPT(canvas_sizes, str, canvas_size, ic, st);
if (canvas_size &&
av_parse_video_size(&ist->dec_ctx->width, &ist->dec_ctx->height, canvas_size) < 0) {
av_log(NULL, AV_LOG_FATAL, "Invalid canvas size: %s.\n", canvas_size);
exit_program(1);
}
break;
}
case AVMEDIA_TYPE_ATTACHMENT:
case AVMEDIA_TYPE_UNKNOWN:
break;
default:
abort();
}
ist->par = avcodec_parameters_alloc();
if (!ist->par)
report_and_exit(AVERROR(ENOMEM));
ret = avcodec_parameters_from_context(ist->par, ist->dec_ctx);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Error initializing the decoder context.\n");
exit_program(1);
}
}
}
static void dump_attachment(AVStream *st, const char *filename)
{
int ret;
AVIOContext *out = NULL;
const AVDictionaryEntry *e;
if (!st->codecpar->extradata_size) {
av_log(NULL, AV_LOG_WARNING, "No extradata to dump in stream #%d:%d.\n",
nb_input_files - 1, st->index);
return;
}
if (!*filename && (e = av_dict_get(st->metadata, "filename", NULL, 0)))
filename = e->value;
if (!*filename) {
av_log(NULL, AV_LOG_FATAL, "No filename specified and no 'filename' tag"
"in stream #%d:%d.\n", nb_input_files - 1, st->index);
exit_program(1);
}
assert_file_overwrite(filename);
if ((ret = avio_open2(&out, filename, AVIO_FLAG_WRITE, &int_cb, NULL)) < 0) {
av_log(NULL, AV_LOG_FATAL, "Could not open file %s for writing.\n",
filename);
exit_program(1);
}
avio_write(out, st->codecpar->extradata, st->codecpar->extradata_size);
avio_flush(out);
avio_close(out);
}
int ifile_open(OptionsContext *o, const char *filename)
{
Demuxer *d;
InputFile *f;
AVFormatContext *ic;
const AVInputFormat *file_iformat = NULL;
int err, i, ret;
int64_t timestamp;
AVDictionary *unused_opts = NULL;
const AVDictionaryEntry *e = NULL;
char * video_codec_name = NULL;
char * audio_codec_name = NULL;
char *subtitle_codec_name = NULL;
char * data_codec_name = NULL;
int scan_all_pmts_set = 0;
int64_t start_time = o->start_time;
int64_t start_time_eof = o->start_time_eof;
int64_t stop_time = o->stop_time;
int64_t recording_time = o->recording_time;
if (stop_time != INT64_MAX && recording_time != INT64_MAX) {
stop_time = INT64_MAX;
av_log(NULL, AV_LOG_WARNING, "-t and -to cannot be used together; using -t.\n");
}
if (stop_time != INT64_MAX && recording_time == INT64_MAX) {
int64_t start = start_time == AV_NOPTS_VALUE ? 0 : start_time;
if (stop_time <= start) {
av_log(NULL, AV_LOG_ERROR, "-to value smaller than -ss; aborting.\n");
exit_program(1);
} else {
recording_time = stop_time - start;
}
}
if (o->format) {
if (!(file_iformat = av_find_input_format(o->format))) {
av_log(NULL, AV_LOG_FATAL, "Unknown input format: '%s'\n", o->format);
exit_program(1);
}
}
if (!strcmp(filename, "-"))
filename = "pipe:";
stdin_interaction &= strncmp(filename, "pipe:", 5) &&
strcmp(filename, "/dev/stdin");
/* get default parameters from command line */
ic = avformat_alloc_context();
if (!ic)
report_and_exit(AVERROR(ENOMEM));
if (o->nb_audio_sample_rate) {
av_dict_set_int(&o->g->format_opts, "sample_rate", o->audio_sample_rate[o->nb_audio_sample_rate - 1].u.i, 0);
}
if (o->nb_audio_channels) {
const AVClass *priv_class;
if (file_iformat && (priv_class = file_iformat->priv_class) &&
av_opt_find(&priv_class, "ch_layout", NULL, 0,
AV_OPT_SEARCH_FAKE_OBJ)) {
char buf[32];
snprintf(buf, sizeof(buf), "%dC", o->audio_channels[o->nb_audio_channels - 1].u.i);
av_dict_set(&o->g->format_opts, "ch_layout", buf, 0);
}
}
if (o->nb_audio_ch_layouts) {
const AVClass *priv_class;
if (file_iformat && (priv_class = file_iformat->priv_class) &&
av_opt_find(&priv_class, "ch_layout", NULL, 0,
AV_OPT_SEARCH_FAKE_OBJ)) {
av_dict_set(&o->g->format_opts, "ch_layout", o->audio_ch_layouts[o->nb_audio_ch_layouts - 1].u.str, 0);
}
}
if (o->nb_frame_rates) {
const AVClass *priv_class;
/* set the format-level framerate option;
* this is important for video grabbers, e.g. x11 */
if (file_iformat && (priv_class = file_iformat->priv_class) &&
av_opt_find(&priv_class, "framerate", NULL, 0,
AV_OPT_SEARCH_FAKE_OBJ)) {
av_dict_set(&o->g->format_opts, "framerate",
o->frame_rates[o->nb_frame_rates - 1].u.str, 0);
}
}
if (o->nb_frame_sizes) {
av_dict_set(&o->g->format_opts, "video_size", o->frame_sizes[o->nb_frame_sizes - 1].u.str, 0);
}
if (o->nb_frame_pix_fmts)
av_dict_set(&o->g->format_opts, "pixel_format", o->frame_pix_fmts[o->nb_frame_pix_fmts - 1].u.str, 0);
MATCH_PER_TYPE_OPT(codec_names, str, video_codec_name, ic, "v");
MATCH_PER_TYPE_OPT(codec_names, str, audio_codec_name, ic, "a");
MATCH_PER_TYPE_OPT(codec_names, str, subtitle_codec_name, ic, "s");
MATCH_PER_TYPE_OPT(codec_names, str, data_codec_name, ic, "d");
if (video_codec_name)
ic->video_codec = find_codec_or_die(video_codec_name , AVMEDIA_TYPE_VIDEO , 0);
if (audio_codec_name)
ic->audio_codec = find_codec_or_die(audio_codec_name , AVMEDIA_TYPE_AUDIO , 0);
if (subtitle_codec_name)
ic->subtitle_codec = find_codec_or_die(subtitle_codec_name, AVMEDIA_TYPE_SUBTITLE, 0);
if (data_codec_name)
ic->data_codec = find_codec_or_die(data_codec_name , AVMEDIA_TYPE_DATA , 0);
ic->video_codec_id = video_codec_name ? ic->video_codec->id : AV_CODEC_ID_NONE;
ic->audio_codec_id = audio_codec_name ? ic->audio_codec->id : AV_CODEC_ID_NONE;
ic->subtitle_codec_id = subtitle_codec_name ? ic->subtitle_codec->id : AV_CODEC_ID_NONE;
ic->data_codec_id = data_codec_name ? ic->data_codec->id : AV_CODEC_ID_NONE;
ic->flags |= AVFMT_FLAG_NONBLOCK;
if (o->bitexact)
ic->flags |= AVFMT_FLAG_BITEXACT;
ic->interrupt_callback = int_cb;
if (!av_dict_get(o->g->format_opts, "scan_all_pmts", NULL, AV_DICT_MATCH_CASE)) {
av_dict_set(&o->g->format_opts, "scan_all_pmts", "1", AV_DICT_DONT_OVERWRITE);
scan_all_pmts_set = 1;
}
/* open the input file with generic avformat function */
err = avformat_open_input(&ic, filename, file_iformat, &o->g->format_opts);
if (err < 0) {
print_error(filename, err);
if (err == AVERROR_PROTOCOL_NOT_FOUND)
av_log(NULL, AV_LOG_ERROR, "Did you mean file:%s?\n", filename);
exit_program(1);
}
if (scan_all_pmts_set)
av_dict_set(&o->g->format_opts, "scan_all_pmts", NULL, AV_DICT_MATCH_CASE);
remove_avoptions(&o->g->format_opts, o->g->codec_opts);
assert_avoptions(o->g->format_opts);
/* apply forced codec ids */
for (i = 0; i < ic->nb_streams; i++)
choose_decoder(o, ic, ic->streams[i], HWACCEL_NONE, AV_HWDEVICE_TYPE_NONE);
if (o->find_stream_info) {
AVDictionary **opts = setup_find_stream_info_opts(ic, o->g->codec_opts);
int orig_nb_streams = ic->nb_streams;
/* If not enough info to get the stream parameters, we decode the
first frames to get it. (used in mpeg case for example) */
ret = avformat_find_stream_info(ic, opts);
for (i = 0; i < orig_nb_streams; i++)
av_dict_free(&opts[i]);
av_freep(&opts);
if (ret < 0) {
av_log(NULL, AV_LOG_FATAL, "%s: could not find codec parameters\n", filename);
if (ic->nb_streams == 0) {
avformat_close_input(&ic);
exit_program(1);
}
}
}
if (start_time != AV_NOPTS_VALUE && start_time_eof != AV_NOPTS_VALUE) {
av_log(NULL, AV_LOG_WARNING, "Cannot use -ss and -sseof both, using -ss for %s\n", filename);
start_time_eof = AV_NOPTS_VALUE;
}
if (start_time_eof != AV_NOPTS_VALUE) {
if (start_time_eof >= 0) {
av_log(NULL, AV_LOG_ERROR, "-sseof value must be negative; aborting\n");
exit_program(1);
}
if (ic->duration > 0) {
start_time = start_time_eof + ic->duration;
if (start_time < 0) {
av_log(NULL, AV_LOG_WARNING, "-sseof value seeks to before start of file %s; ignored\n", filename);
start_time = AV_NOPTS_VALUE;
}
} else
av_log(NULL, AV_LOG_WARNING, "Cannot use -sseof, duration of %s not known\n", filename);
}
timestamp = (start_time == AV_NOPTS_VALUE) ? 0 : start_time;
/* add the stream start time */
if (!o->seek_timestamp && ic->start_time != AV_NOPTS_VALUE)
timestamp += ic->start_time;
/* if seeking requested, we execute it */
if (start_time != AV_NOPTS_VALUE) {
int64_t seek_timestamp = timestamp;
if (!(ic->iformat->flags & AVFMT_SEEK_TO_PTS)) {
int dts_heuristic = 0;
for (i=0; i<ic->nb_streams; i++) {
const AVCodecParameters *par = ic->streams[i]->codecpar;
if (par->video_delay) {
dts_heuristic = 1;
break;
}
}
if (dts_heuristic) {
seek_timestamp -= 3*AV_TIME_BASE / 23;
}
}
ret = avformat_seek_file(ic, -1, INT64_MIN, seek_timestamp, seek_timestamp, 0);
if (ret < 0) {
av_log(NULL, AV_LOG_WARNING, "%s: could not seek to position %0.3f\n",
filename, (double)timestamp / AV_TIME_BASE);
}
}
/* update the current parameters so that they match the one of the input stream */
add_input_streams(o, ic);
/* dump the file content */
av_dump_format(ic, nb_input_files, filename, 0);
d = allocate_array_elem(&input_files, sizeof(*d), &nb_input_files);
f = &d->f;
f->ctx = ic;
f->index = nb_input_files - 1;
f->ist_index = nb_input_streams - ic->nb_streams;
f->start_time = start_time;
f->recording_time = recording_time;
f->input_sync_ref = o->input_sync_ref;
f->input_ts_offset = o->input_ts_offset;
f->ts_offset = o->input_ts_offset - (copy_ts ? (start_at_zero && ic->start_time != AV_NOPTS_VALUE ? ic->start_time : 0) : timestamp);
f->nb_streams = ic->nb_streams;
f->rate_emu = o->rate_emu;
f->accurate_seek = o->accurate_seek;
d->loop = o->loop;
d->duration = 0;
d->time_base = (AVRational){ 1, 1 };
f->readrate = o->readrate ? o->readrate : 0.0;
if (f->readrate < 0.0f) {
av_log(NULL, AV_LOG_ERROR, "Option -readrate for Input #%d is %0.3f; it must be non-negative.\n", f->index, f->readrate);
exit_program(1);
}
if (f->readrate && f->rate_emu) {
av_log(NULL, AV_LOG_WARNING, "Both -readrate and -re set for Input #%d. Using -readrate %0.3f.\n", f->index, f->readrate);
f->rate_emu = 0;
}
d->thread_queue_size = o->thread_queue_size;
/* check if all codec options have been used */
unused_opts = strip_specifiers(o->g->codec_opts);
for (i = f->ist_index; i < nb_input_streams; i++) {
e = NULL;
while ((e = av_dict_get(input_streams[i]->decoder_opts, "", e,
AV_DICT_IGNORE_SUFFIX)))
av_dict_set(&unused_opts, e->key, NULL, 0);
}
e = NULL;
while ((e = av_dict_get(unused_opts, "", e, AV_DICT_IGNORE_SUFFIX))) {
const AVClass *class = avcodec_get_class();
const AVOption *option = av_opt_find(&class, e->key, NULL, 0,
AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ);
const AVClass *fclass = avformat_get_class();
const AVOption *foption = av_opt_find(&fclass, e->key, NULL, 0,
AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ);
if (!option || foption)
continue;
if (!(option->flags & AV_OPT_FLAG_DECODING_PARAM)) {
av_log(NULL, AV_LOG_ERROR, "Codec AVOption %s (%s) specified for "
"input file #%d (%s) is not a decoding option.\n", e->key,
option->help ? option->help : "", f->index,
filename);
exit_program(1);
}
av_log(NULL, AV_LOG_WARNING, "Codec AVOption %s (%s) specified for "
"input file #%d (%s) has not been used for any stream. The most "
"likely reason is either wrong type (e.g. a video option with "
"no video streams) or that it is a private option of some decoder "
"which was not actually used for any stream.\n", e->key,
option->help ? option->help : "", f->index, filename);
}
av_dict_free(&unused_opts);
for (i = 0; i < o->nb_dump_attachment; i++) {
int j;
for (j = 0; j < ic->nb_streams; j++) {
AVStream *st = ic->streams[j];
if (check_stream_specifier(ic, st, o->dump_attachment[i].specifier) == 1)
dump_attachment(st, o->dump_attachment[i].u.str);
}
}
input_stream_potentially_available = 1;
return 0;
}
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