/
utils.c
4105 lines (3619 loc) · 137 KB
/
utils.c
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/*
* various utility functions for use within FFmpeg
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
*
* 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
*/
/* #define DEBUG */
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#include "libavcodec/internal.h"
#include "libavcodec/raw.h"
#include "libavcodec/bytestream.h"
#include "libavutil/avassert.h"
#include "libavutil/opt.h"
#include "libavutil/dict.h"
#include "libavutil/pixdesc.h"
#include "metadata.h"
#include "id3v2.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/mathematics.h"
#include "libavutil/parseutils.h"
#include "libavutil/time.h"
#include "libavutil/timestamp.h"
#include "riff.h"
#include "audiointerleave.h"
#include "url.h"
#include <stdarg.h>
#if CONFIG_NETWORK
#include "network.h"
#endif
#undef NDEBUG
#include <assert.h>
/**
* @file
* various utility functions for use within FFmpeg
*/
unsigned avformat_version(void)
{
av_assert0(LIBAVFORMAT_VERSION_MICRO >= 100);
return LIBAVFORMAT_VERSION_INT;
}
const char *avformat_configuration(void)
{
return FFMPEG_CONFIGURATION;
}
const char *avformat_license(void)
{
#define LICENSE_PREFIX "libavformat license: "
return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
}
#define RELATIVE_TS_BASE (INT64_MAX - (1LL<<48))
static int is_relative(int64_t ts) {
return ts > (RELATIVE_TS_BASE - (1LL<<48));
}
/** head of registered input format linked list */
static AVInputFormat *first_iformat = NULL;
/** head of registered output format linked list */
static AVOutputFormat *first_oformat = NULL;
AVInputFormat *av_iformat_next(AVInputFormat *f)
{
if(f) return f->next;
else return first_iformat;
}
AVOutputFormat *av_oformat_next(AVOutputFormat *f)
{
if(f) return f->next;
else return first_oformat;
}
void av_register_input_format(AVInputFormat *format)
{
AVInputFormat **p;
p = &first_iformat;
while (*p != NULL) p = &(*p)->next;
*p = format;
format->next = NULL;
}
void av_register_output_format(AVOutputFormat *format)
{
AVOutputFormat **p;
p = &first_oformat;
while (*p != NULL) p = &(*p)->next;
*p = format;
format->next = NULL;
}
int av_match_ext(const char *filename, const char *extensions)
{
const char *ext, *p;
char ext1[32], *q;
if(!filename)
return 0;
ext = strrchr(filename, '.');
if (ext) {
ext++;
p = extensions;
for(;;) {
q = ext1;
while (*p != '\0' && *p != ',' && q-ext1<sizeof(ext1)-1)
*q++ = *p++;
*q = '\0';
if (!av_strcasecmp(ext1, ext))
return 1;
if (*p == '\0')
break;
p++;
}
}
return 0;
}
static int match_format(const char *name, const char *names)
{
const char *p;
int len, namelen;
if (!name || !names)
return 0;
namelen = strlen(name);
while ((p = strchr(names, ','))) {
len = FFMAX(p - names, namelen);
if (!av_strncasecmp(name, names, len))
return 1;
names = p+1;
}
return !av_strcasecmp(name, names);
}
AVOutputFormat *av_guess_format(const char *short_name, const char *filename,
const char *mime_type)
{
AVOutputFormat *fmt = NULL, *fmt_found;
int score_max, score;
/* specific test for image sequences */
#if CONFIG_IMAGE2_MUXER
if (!short_name && filename &&
av_filename_number_test(filename) &&
ff_guess_image2_codec(filename) != AV_CODEC_ID_NONE) {
return av_guess_format("image2", NULL, NULL);
}
#endif
/* Find the proper file type. */
fmt_found = NULL;
score_max = 0;
while ((fmt = av_oformat_next(fmt))) {
score = 0;
if (fmt->name && short_name && match_format(short_name, fmt->name))
score += 100;
if (fmt->mime_type && mime_type && !strcmp(fmt->mime_type, mime_type))
score += 10;
if (filename && fmt->extensions &&
av_match_ext(filename, fmt->extensions)) {
score += 5;
}
if (score > score_max) {
score_max = score;
fmt_found = fmt;
}
}
return fmt_found;
}
enum AVCodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
const char *filename, const char *mime_type, enum AVMediaType type){
if(type == AVMEDIA_TYPE_VIDEO){
enum AVCodecID codec_id= AV_CODEC_ID_NONE;
#if CONFIG_IMAGE2_MUXER
if(!strcmp(fmt->name, "image2") || !strcmp(fmt->name, "image2pipe")){
codec_id= ff_guess_image2_codec(filename);
}
#endif
if(codec_id == AV_CODEC_ID_NONE)
codec_id= fmt->video_codec;
return codec_id;
}else if(type == AVMEDIA_TYPE_AUDIO)
return fmt->audio_codec;
else if (type == AVMEDIA_TYPE_SUBTITLE)
return fmt->subtitle_codec;
else
return AV_CODEC_ID_NONE;
}
AVInputFormat *av_find_input_format(const char *short_name)
{
AVInputFormat *fmt = NULL;
while ((fmt = av_iformat_next(fmt))) {
if (match_format(short_name, fmt->name))
return fmt;
}
return NULL;
}
int ffio_limit(AVIOContext *s, int size)
{
if(s->maxsize>=0){
int64_t remaining= s->maxsize - avio_tell(s);
if(remaining < size){
int64_t newsize= avio_size(s);
if(!s->maxsize || s->maxsize<newsize)
s->maxsize= newsize - !newsize;
remaining= s->maxsize - avio_tell(s);
remaining= FFMAX(remaining, 0);
}
if(s->maxsize>=0 && remaining+1 < size){
av_log(NULL, remaining ? AV_LOG_ERROR : AV_LOG_DEBUG, "Truncating packet of size %d to %"PRId64"\n", size, remaining+1);
size= remaining+1;
}
}
return size;
}
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
{
int ret;
int orig_size = size;
size= ffio_limit(s, size);
ret= av_new_packet(pkt, size);
if(ret<0)
return ret;
pkt->pos= avio_tell(s);
ret= avio_read(s, pkt->data, size);
if(ret<=0)
av_free_packet(pkt);
else
av_shrink_packet(pkt, ret);
if (pkt->size < orig_size)
pkt->flags |= AV_PKT_FLAG_CORRUPT;
return ret;
}
int av_append_packet(AVIOContext *s, AVPacket *pkt, int size)
{
int ret;
int old_size;
if (!pkt->size)
return av_get_packet(s, pkt, size);
old_size = pkt->size;
ret = av_grow_packet(pkt, size);
if (ret < 0)
return ret;
ret = avio_read(s, pkt->data + old_size, size);
av_shrink_packet(pkt, old_size + FFMAX(ret, 0));
return ret;
}
int av_filename_number_test(const char *filename)
{
char buf[1024];
return filename && (av_get_frame_filename(buf, sizeof(buf), filename, 1)>=0);
}
AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened, int *score_ret)
{
AVProbeData lpd = *pd;
AVInputFormat *fmt1 = NULL, *fmt;
int score, nodat = 0, score_max=0;
const static uint8_t zerobuffer[AVPROBE_PADDING_SIZE];
if (!lpd.buf)
lpd.buf = zerobuffer;
if (lpd.buf_size > 10 && ff_id3v2_match(lpd.buf, ID3v2_DEFAULT_MAGIC)) {
int id3len = ff_id3v2_tag_len(lpd.buf);
if (lpd.buf_size > id3len + 16) {
lpd.buf += id3len;
lpd.buf_size -= id3len;
}else
nodat = 1;
}
fmt = NULL;
while ((fmt1 = av_iformat_next(fmt1))) {
if (!is_opened == !(fmt1->flags & AVFMT_NOFILE))
continue;
score = 0;
if (fmt1->read_probe) {
score = fmt1->read_probe(&lpd);
if(fmt1->extensions && av_match_ext(lpd.filename, fmt1->extensions))
score = FFMAX(score, nodat ? AVPROBE_SCORE_MAX/4-1 : 1);
} else if (fmt1->extensions) {
if (av_match_ext(lpd.filename, fmt1->extensions)) {
score = 50;
}
}
if (score > score_max) {
score_max = score;
fmt = fmt1;
}else if (score == score_max)
fmt = NULL;
}
*score_ret= score_max;
return fmt;
}
AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max)
{
int score_ret;
AVInputFormat *fmt= av_probe_input_format3(pd, is_opened, &score_ret);
if(score_ret > *score_max){
*score_max= score_ret;
return fmt;
}else
return NULL;
}
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened){
int score=0;
return av_probe_input_format2(pd, is_opened, &score);
}
static int set_codec_from_probe_data(AVFormatContext *s, AVStream *st, AVProbeData *pd)
{
static const struct {
const char *name; enum AVCodecID id; enum AVMediaType type;
} fmt_id_type[] = {
{ "aac" , AV_CODEC_ID_AAC , AVMEDIA_TYPE_AUDIO },
{ "ac3" , AV_CODEC_ID_AC3 , AVMEDIA_TYPE_AUDIO },
{ "dts" , AV_CODEC_ID_DTS , AVMEDIA_TYPE_AUDIO },
{ "eac3" , AV_CODEC_ID_EAC3 , AVMEDIA_TYPE_AUDIO },
{ "h264" , AV_CODEC_ID_H264 , AVMEDIA_TYPE_VIDEO },
{ "loas" , AV_CODEC_ID_AAC_LATM , AVMEDIA_TYPE_AUDIO },
{ "m4v" , AV_CODEC_ID_MPEG4 , AVMEDIA_TYPE_VIDEO },
{ "mp3" , AV_CODEC_ID_MP3 , AVMEDIA_TYPE_AUDIO },
{ "mpegvideo", AV_CODEC_ID_MPEG2VIDEO, AVMEDIA_TYPE_VIDEO },
{ 0 }
};
int score;
AVInputFormat *fmt = av_probe_input_format3(pd, 1, &score);
if (fmt && st->request_probe <= score) {
int i;
av_log(s, AV_LOG_DEBUG, "Probe with size=%d, packets=%d detected %s with score=%d\n",
pd->buf_size, MAX_PROBE_PACKETS - st->probe_packets, fmt->name, score);
for (i = 0; fmt_id_type[i].name; i++) {
if (!strcmp(fmt->name, fmt_id_type[i].name)) {
st->codec->codec_id = fmt_id_type[i].id;
st->codec->codec_type = fmt_id_type[i].type;
break;
}
}
}
return score;
}
/************************************************************/
/* input media file */
int av_demuxer_open(AVFormatContext *ic){
int err;
if (ic->iformat->read_header) {
err = ic->iformat->read_header(ic);
if (err < 0)
return err;
}
if (ic->pb && !ic->data_offset)
ic->data_offset = avio_tell(ic->pb);
return 0;
}
/** size of probe buffer, for guessing file type from file contents */
#define PROBE_BUF_MIN 2048
#define PROBE_BUF_MAX (1<<20)
int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
const char *filename, void *logctx,
unsigned int offset, unsigned int max_probe_size)
{
AVProbeData pd = { filename ? filename : "", NULL, -offset };
unsigned char *buf = NULL;
int ret = 0, probe_size;
if (!max_probe_size) {
max_probe_size = PROBE_BUF_MAX;
} else if (max_probe_size > PROBE_BUF_MAX) {
max_probe_size = PROBE_BUF_MAX;
} else if (max_probe_size < PROBE_BUF_MIN) {
return AVERROR(EINVAL);
}
if (offset >= max_probe_size) {
return AVERROR(EINVAL);
}
for(probe_size= PROBE_BUF_MIN; probe_size<=max_probe_size && !*fmt;
probe_size = FFMIN(probe_size<<1, FFMAX(max_probe_size, probe_size+1))) {
int score = probe_size < max_probe_size ? AVPROBE_SCORE_RETRY : 0;
int buf_offset = (probe_size == PROBE_BUF_MIN) ? 0 : probe_size>>1;
void *buftmp;
if (probe_size < offset) {
continue;
}
/* read probe data */
buftmp = av_realloc(buf, probe_size + AVPROBE_PADDING_SIZE);
if(!buftmp){
av_free(buf);
return AVERROR(ENOMEM);
}
buf=buftmp;
if ((ret = avio_read(pb, buf + buf_offset, probe_size - buf_offset)) < 0) {
/* fail if error was not end of file, otherwise, lower score */
if (ret != AVERROR_EOF) {
av_free(buf);
return ret;
}
score = 0;
ret = 0; /* error was end of file, nothing read */
}
pd.buf_size += ret;
pd.buf = &buf[offset];
memset(pd.buf + pd.buf_size, 0, AVPROBE_PADDING_SIZE);
/* guess file format */
*fmt = av_probe_input_format2(&pd, 1, &score);
if(*fmt){
if(score <= AVPROBE_SCORE_RETRY){ //this can only be true in the last iteration
av_log(logctx, AV_LOG_WARNING, "Format %s detected only with low score of %d, misdetection possible!\n", (*fmt)->name, score);
}else
av_log(logctx, AV_LOG_DEBUG, "Format %s probed with size=%d and score=%d\n", (*fmt)->name, probe_size, score);
}
}
if (!*fmt) {
av_free(buf);
return AVERROR_INVALIDDATA;
}
/* rewind. reuse probe buffer to avoid seeking */
ret = ffio_rewind_with_probe_data(pb, &buf, pd.buf_size);
return ret;
}
/* open input file and probe the format if necessary */
static int init_input(AVFormatContext *s, const char *filename, AVDictionary **options)
{
int ret;
AVProbeData pd = {filename, NULL, 0};
int score = AVPROBE_SCORE_RETRY;
if (s->pb) {
s->flags |= AVFMT_FLAG_CUSTOM_IO;
if (!s->iformat)
return av_probe_input_buffer(s->pb, &s->iformat, filename, s, 0, s->probesize);
else if (s->iformat->flags & AVFMT_NOFILE)
av_log(s, AV_LOG_WARNING, "Custom AVIOContext makes no sense and "
"will be ignored with AVFMT_NOFILE format.\n");
return 0;
}
if ( (s->iformat && s->iformat->flags & AVFMT_NOFILE) ||
(!s->iformat && (s->iformat = av_probe_input_format2(&pd, 0, &score))))
return 0;
if ((ret = avio_open2(&s->pb, filename, AVIO_FLAG_READ | s->avio_flags,
&s->interrupt_callback, options)) < 0)
return ret;
if (s->iformat)
return 0;
return av_probe_input_buffer(s->pb, &s->iformat, filename, s, 0, s->probesize);
}
static AVPacket *add_to_pktbuf(AVPacketList **packet_buffer, AVPacket *pkt,
AVPacketList **plast_pktl){
AVPacketList *pktl = av_mallocz(sizeof(AVPacketList));
if (!pktl)
return NULL;
if (*packet_buffer)
(*plast_pktl)->next = pktl;
else
*packet_buffer = pktl;
/* add the packet in the buffered packet list */
*plast_pktl = pktl;
pktl->pkt= *pkt;
return &pktl->pkt;
}
void avformat_queue_attached_pictures(AVFormatContext *s)
{
int i;
for (i = 0; i < s->nb_streams; i++)
if (s->streams[i]->disposition & AV_DISPOSITION_ATTACHED_PIC &&
s->streams[i]->discard < AVDISCARD_ALL) {
AVPacket copy = s->streams[i]->attached_pic;
copy.destruct = NULL;
add_to_pktbuf(&s->raw_packet_buffer, ©, &s->raw_packet_buffer_end);
}
}
int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)
{
AVFormatContext *s = *ps;
int ret = 0;
AVDictionary *tmp = NULL;
ID3v2ExtraMeta *id3v2_extra_meta = NULL;
if (!s && !(s = avformat_alloc_context()))
return AVERROR(ENOMEM);
if (!s->av_class){
av_log(NULL, AV_LOG_ERROR, "Input context has not been properly allocated by avformat_alloc_context() and is not NULL either\n");
return AVERROR(EINVAL);
}
if (fmt)
s->iformat = fmt;
if (options)
av_dict_copy(&tmp, *options, 0);
if ((ret = av_opt_set_dict(s, &tmp)) < 0)
goto fail;
if ((ret = init_input(s, filename, &tmp)) < 0)
goto fail;
avio_skip(s->pb, s->skip_initial_bytes);
/* check filename in case an image number is expected */
if (s->iformat->flags & AVFMT_NEEDNUMBER) {
if (!av_filename_number_test(filename)) {
ret = AVERROR(EINVAL);
goto fail;
}
}
s->duration = s->start_time = AV_NOPTS_VALUE;
av_strlcpy(s->filename, filename ? filename : "", sizeof(s->filename));
/* allocate private data */
if (s->iformat->priv_data_size > 0) {
if (!(s->priv_data = av_mallocz(s->iformat->priv_data_size))) {
ret = AVERROR(ENOMEM);
goto fail;
}
if (s->iformat->priv_class) {
*(const AVClass**)s->priv_data = s->iformat->priv_class;
av_opt_set_defaults(s->priv_data);
if ((ret = av_opt_set_dict(s->priv_data, &tmp)) < 0)
goto fail;
}
}
/* e.g. AVFMT_NOFILE formats will not have a AVIOContext */
if (s->pb)
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
if (!(s->flags&AVFMT_FLAG_PRIV_OPT) && s->iformat->read_header)
if ((ret = s->iformat->read_header(s)) < 0)
goto fail;
if (id3v2_extra_meta) {
if (!strcmp(s->iformat->name, "mp3")) {
if((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0)
goto fail;
} else
av_log(s, AV_LOG_DEBUG, "demuxer does not support additional id3 data, skipping\n");
}
ff_id3v2_free_extra_meta(&id3v2_extra_meta);
avformat_queue_attached_pictures(s);
if (!(s->flags&AVFMT_FLAG_PRIV_OPT) && s->pb && !s->data_offset)
s->data_offset = avio_tell(s->pb);
s->raw_packet_buffer_remaining_size = RAW_PACKET_BUFFER_SIZE;
if (options) {
av_dict_free(options);
*options = tmp;
}
*ps = s;
return 0;
fail:
ff_id3v2_free_extra_meta(&id3v2_extra_meta);
av_dict_free(&tmp);
if (s->pb && !(s->flags & AVFMT_FLAG_CUSTOM_IO))
avio_close(s->pb);
avformat_free_context(s);
*ps = NULL;
return ret;
}
/*******************************************************/
static void probe_codec(AVFormatContext *s, AVStream *st, const AVPacket *pkt)
{
if(st->request_probe>0){
AVProbeData *pd = &st->probe_data;
int end;
av_log(s, AV_LOG_DEBUG, "probing stream %d pp:%d\n", st->index, st->probe_packets);
--st->probe_packets;
if (pkt) {
uint8_t *new_buf = av_realloc(pd->buf, pd->buf_size+pkt->size+AVPROBE_PADDING_SIZE);
if(!new_buf)
goto no_packet;
pd->buf = new_buf;
memcpy(pd->buf+pd->buf_size, pkt->data, pkt->size);
pd->buf_size += pkt->size;
memset(pd->buf+pd->buf_size, 0, AVPROBE_PADDING_SIZE);
} else {
no_packet:
st->probe_packets = 0;
if (!pd->buf_size) {
av_log(s, AV_LOG_WARNING, "nothing to probe for stream %d\n",
st->index);
}
}
end= s->raw_packet_buffer_remaining_size <= 0
|| st->probe_packets<=0;
if(end || av_log2(pd->buf_size) != av_log2(pd->buf_size - pkt->size)){
int score= set_codec_from_probe_data(s, st, pd);
if( (st->codec->codec_id != AV_CODEC_ID_NONE && score > AVPROBE_SCORE_RETRY)
|| end){
pd->buf_size=0;
av_freep(&pd->buf);
st->request_probe= -1;
if(st->codec->codec_id != AV_CODEC_ID_NONE){
av_log(s, AV_LOG_DEBUG, "probed stream %d\n", st->index);
}else
av_log(s, AV_LOG_WARNING, "probed stream %d failed\n", st->index);
}
}
}
}
static void force_codec_ids(AVFormatContext *s, AVStream *st)
{
switch(st->codec->codec_type){
case AVMEDIA_TYPE_VIDEO:
if(s->video_codec_id) st->codec->codec_id= s->video_codec_id;
break;
case AVMEDIA_TYPE_AUDIO:
if(s->audio_codec_id) st->codec->codec_id= s->audio_codec_id;
break;
case AVMEDIA_TYPE_SUBTITLE:
if(s->subtitle_codec_id)st->codec->codec_id= s->subtitle_codec_id;
break;
}
}
int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, i;
AVStream *st;
for(;;){
AVPacketList *pktl = s->raw_packet_buffer;
if (pktl) {
*pkt = pktl->pkt;
st = s->streams[pkt->stream_index];
if(st->request_probe <= 0){
s->raw_packet_buffer = pktl->next;
s->raw_packet_buffer_remaining_size += pkt->size;
av_free(pktl);
return 0;
}
}
pkt->data = NULL;
pkt->size = 0;
av_init_packet(pkt);
ret= s->iformat->read_packet(s, pkt);
if (ret < 0) {
if (!pktl || ret == AVERROR(EAGAIN))
return ret;
for (i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
if (st->probe_packets) {
probe_codec(s, st, NULL);
}
av_assert0(st->request_probe <= 0);
}
continue;
}
if ((s->flags & AVFMT_FLAG_DISCARD_CORRUPT) &&
(pkt->flags & AV_PKT_FLAG_CORRUPT)) {
av_log(s, AV_LOG_WARNING,
"Dropped corrupted packet (stream = %d)\n",
pkt->stream_index);
av_free_packet(pkt);
continue;
}
if(!(s->flags & AVFMT_FLAG_KEEP_SIDE_DATA))
av_packet_merge_side_data(pkt);
if(pkt->stream_index >= (unsigned)s->nb_streams){
av_log(s, AV_LOG_ERROR, "Invalid stream index %d\n", pkt->stream_index);
continue;
}
st= s->streams[pkt->stream_index];
force_codec_ids(s, st);
/* TODO: audio: time filter; video: frame reordering (pts != dts) */
if (s->use_wallclock_as_timestamps)
pkt->dts = pkt->pts = av_rescale_q(av_gettime(), AV_TIME_BASE_Q, st->time_base);
if(!pktl && st->request_probe <= 0)
return ret;
add_to_pktbuf(&s->raw_packet_buffer, pkt, &s->raw_packet_buffer_end);
s->raw_packet_buffer_remaining_size -= pkt->size;
probe_codec(s, st, pkt);
}
}
#if FF_API_READ_PACKET
int av_read_packet(AVFormatContext *s, AVPacket *pkt)
{
return ff_read_packet(s, pkt);
}
#endif
/**********************************************************/
static int determinable_frame_size(AVCodecContext *avctx)
{
if (/*avctx->codec_id == AV_CODEC_ID_AAC ||*/
avctx->codec_id == AV_CODEC_ID_MP1 ||
avctx->codec_id == AV_CODEC_ID_MP2 ||
avctx->codec_id == AV_CODEC_ID_MP3/* ||
avctx->codec_id == AV_CODEC_ID_CELT*/)
return 1;
return 0;
}
/**
* Get the number of samples of an audio frame. Return -1 on error.
*/
int ff_get_audio_frame_size(AVCodecContext *enc, int size, int mux)
{
int frame_size;
/* give frame_size priority if demuxing */
if (!mux && enc->frame_size > 1)
return enc->frame_size;
if ((frame_size = av_get_audio_frame_duration(enc, size)) > 0)
return frame_size;
/* fallback to using frame_size if muxing */
if (enc->frame_size > 1)
return enc->frame_size;
return -1;
}
/**
* Return the frame duration in seconds. Return 0 if not available.
*/
void ff_compute_frame_duration(int *pnum, int *pden, AVStream *st,
AVCodecParserContext *pc, AVPacket *pkt)
{
int frame_size;
*pnum = 0;
*pden = 0;
switch(st->codec->codec_type) {
case AVMEDIA_TYPE_VIDEO:
if (st->r_frame_rate.num && !pc) {
*pnum = st->r_frame_rate.den;
*pden = st->r_frame_rate.num;
} else if(st->time_base.num*1000LL > st->time_base.den) {
*pnum = st->time_base.num;
*pden = st->time_base.den;
}else if(st->codec->time_base.num*1000LL > st->codec->time_base.den){
*pnum = st->codec->time_base.num;
*pden = st->codec->time_base.den;
if (pc && pc->repeat_pict) {
*pnum = (*pnum) * (1 + pc->repeat_pict);
}
//If this codec can be interlaced or progressive then we need a parser to compute duration of a packet
//Thus if we have no parser in such case leave duration undefined.
if(st->codec->ticks_per_frame>1 && !pc){
*pnum = *pden = 0;
}
}
break;
case AVMEDIA_TYPE_AUDIO:
frame_size = ff_get_audio_frame_size(st->codec, pkt->size, 0);
if (frame_size <= 0 || st->codec->sample_rate <= 0)
break;
*pnum = frame_size;
*pden = st->codec->sample_rate;
break;
default:
break;
}
}
static int is_intra_only(AVCodecContext *enc){
const AVCodecDescriptor *desc;
if(enc->codec_type != AVMEDIA_TYPE_VIDEO)
return 1;
desc = av_codec_get_codec_descriptor(enc);
if (!desc) {
desc = avcodec_descriptor_get(enc->codec_id);
av_codec_set_codec_descriptor(enc, desc);
}
if (desc)
return !!(desc->props & AV_CODEC_PROP_INTRA_ONLY);
return 0;
}
static int has_decode_delay_been_guessed(AVStream *st)
{
if(st->codec->codec_id != AV_CODEC_ID_H264) return 1;
if(!st->info) // if we have left find_stream_info then nb_decoded_frames wont increase anymore for stream copy
return 1;
#if CONFIG_H264_DECODER
if(st->codec->has_b_frames &&
avpriv_h264_has_num_reorder_frames(st->codec) == st->codec->has_b_frames)
return 1;
#endif
if(st->codec->has_b_frames<3)
return st->nb_decoded_frames >= 7;
else if(st->codec->has_b_frames<4)
return st->nb_decoded_frames >= 18;
else
return st->nb_decoded_frames >= 20;
}
static AVPacketList *get_next_pkt(AVFormatContext *s, AVStream *st, AVPacketList *pktl)
{
if (pktl->next)
return pktl->next;
if (pktl == s->parse_queue_end)
return s->packet_buffer;
return NULL;
}
static void update_initial_timestamps(AVFormatContext *s, int stream_index,
int64_t dts, int64_t pts)
{
AVStream *st= s->streams[stream_index];
AVPacketList *pktl= s->parse_queue ? s->parse_queue : s->packet_buffer;
int64_t pts_buffer[MAX_REORDER_DELAY+1];
int64_t shift;
int i, delay;
if(st->first_dts != AV_NOPTS_VALUE || dts == AV_NOPTS_VALUE || st->cur_dts == AV_NOPTS_VALUE || is_relative(dts))
return;
delay = st->codec->has_b_frames;
st->first_dts= dts - (st->cur_dts - RELATIVE_TS_BASE);
st->cur_dts= dts;
shift = st->first_dts - RELATIVE_TS_BASE;
for (i=0; i<MAX_REORDER_DELAY+1; i++)
pts_buffer[i] = AV_NOPTS_VALUE;
if (is_relative(pts))
pts += shift;
for(; pktl; pktl= get_next_pkt(s, st, pktl)){
if(pktl->pkt.stream_index != stream_index)
continue;
if(is_relative(pktl->pkt.pts))
pktl->pkt.pts += shift;
if(is_relative(pktl->pkt.dts))
pktl->pkt.dts += shift;
if(st->start_time == AV_NOPTS_VALUE && pktl->pkt.pts != AV_NOPTS_VALUE)
st->start_time= pktl->pkt.pts;
if(pktl->pkt.pts != AV_NOPTS_VALUE && delay <= MAX_REORDER_DELAY && has_decode_delay_been_guessed(st)){
pts_buffer[0]= pktl->pkt.pts;
for(i=0; i<delay && pts_buffer[i] > pts_buffer[i+1]; i++)
FFSWAP(int64_t, pts_buffer[i], pts_buffer[i+1]);
if(pktl->pkt.dts == AV_NOPTS_VALUE)
pktl->pkt.dts= pts_buffer[0];
}
}
if (st->start_time == AV_NOPTS_VALUE)
st->start_time = pts;
}
static void update_initial_durations(AVFormatContext *s, AVStream *st,
int stream_index, int duration)
{
AVPacketList *pktl= s->parse_queue ? s->parse_queue : s->packet_buffer;
int64_t cur_dts= RELATIVE_TS_BASE;
if(st->first_dts != AV_NOPTS_VALUE){
cur_dts= st->first_dts;
for(; pktl; pktl= get_next_pkt(s, st, pktl)){
if(pktl->pkt.stream_index == stream_index){
if(pktl->pkt.pts != pktl->pkt.dts || pktl->pkt.dts != AV_NOPTS_VALUE || pktl->pkt.duration)
break;
cur_dts -= duration;
}
}
if(pktl && pktl->pkt.dts != st->first_dts) {
av_log(s, AV_LOG_DEBUG, "first_dts %s not matching first dts %s in que\n", av_ts2str(st->first_dts), av_ts2str(pktl->pkt.dts));
return;
}
if(!pktl) {
av_log(s, AV_LOG_DEBUG, "first_dts %s but no packet with dts in ques\n", av_ts2str(st->first_dts));
return;
}
pktl= s->parse_queue ? s->parse_queue : s->packet_buffer;
st->first_dts = cur_dts;
}else if(st->cur_dts != RELATIVE_TS_BASE)
return;
for(; pktl; pktl= get_next_pkt(s, st, pktl)){
if(pktl->pkt.stream_index != stream_index)
continue;
if(pktl->pkt.pts == pktl->pkt.dts && (pktl->pkt.dts == AV_NOPTS_VALUE || pktl->pkt.dts == st->first_dts)
&& !pktl->pkt.duration){
pktl->pkt.dts= cur_dts;
if(!st->codec->has_b_frames)
pktl->pkt.pts= cur_dts;
// if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO)
pktl->pkt.duration = duration;
}else
break;
cur_dts = pktl->pkt.dts + pktl->pkt.duration;
}
if(!pktl)
st->cur_dts= cur_dts;
}
static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
AVCodecParserContext *pc, AVPacket *pkt)
{
int num, den, presentation_delayed, delay, i;
int64_t offset;
if (s->flags & AVFMT_FLAG_NOFILLIN)
return;
if((s->flags & AVFMT_FLAG_IGNDTS) && pkt->pts != AV_NOPTS_VALUE)
pkt->dts= AV_NOPTS_VALUE;
if (st->codec->codec_id != AV_CODEC_ID_H264 && pc && pc->pict_type == AV_PICTURE_TYPE_B)
//FIXME Set low_delay = 0 when has_b_frames = 1
st->codec->has_b_frames = 1;