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ffmpeg/libavformat/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
*/
#include <stdint.h>
#include "config.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/bprint.h"
#include "libavutil/dict.h"
#include "libavutil/internal.h"
#include "libavutil/pixfmt.h"
#include "libavutil/thread.h"
#include "libavutil/time.h"
#include "libavcodec/internal.h"
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#if CONFIG_NETWORK
#include "network.h"
#endif
static AVMutex avformat_mutex = AV_MUTEX_INITIALIZER;
/**
* @file
* various utility functions for use within FFmpeg
*/
int ff_lock_avformat(void)
{
return ff_mutex_lock(&avformat_mutex) ? -1 : 0;
}
int ff_unlock_avformat(void)
{
return ff_mutex_unlock(&avformat_mutex) ? -1 : 0;
}
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
{
av_assert0(!dst->codec_whitelist &&
!dst->format_whitelist &&
!dst->protocol_whitelist &&
!dst->protocol_blacklist);
dst-> codec_whitelist = av_strdup(src->codec_whitelist);
dst->format_whitelist = av_strdup(src->format_whitelist);
dst->protocol_whitelist = av_strdup(src->protocol_whitelist);
dst->protocol_blacklist = av_strdup(src->protocol_blacklist);
if ( (src-> codec_whitelist && !dst-> codec_whitelist)
|| (src-> format_whitelist && !dst-> format_whitelist)
|| (src->protocol_whitelist && !dst->protocol_whitelist)
|| (src->protocol_blacklist && !dst->protocol_blacklist)) {
av_log(dst, AV_LOG_ERROR, "Failed to duplicate black/whitelist\n");
return AVERROR(ENOMEM);
}
return 0;
}
const AVCodec *ff_find_decoder(AVFormatContext *s, const AVStream *st,
enum AVCodecID codec_id)
{
switch (st->codecpar->codec_type) {
case AVMEDIA_TYPE_VIDEO:
if (s->video_codec) return s->video_codec;
break;
case AVMEDIA_TYPE_AUDIO:
if (s->audio_codec) return s->audio_codec;
break;
case AVMEDIA_TYPE_SUBTITLE:
if (s->subtitle_codec) return s->subtitle_codec;
break;
}
return avcodec_find_decoder(codec_id);
}
/* an arbitrarily chosen "sane" max packet size -- 50M */
#define SANE_CHUNK_SIZE (50000000)
/* Read the data in sane-sized chunks and append to pkt.
* Return the number of bytes read or an error. */
static int append_packet_chunked(AVIOContext *s, AVPacket *pkt, int size)
{
int orig_size = pkt->size;
int ret;
do {
int prev_size = pkt->size;
int read_size;
/* When the caller requests a lot of data, limit it to the amount
* left in file or SANE_CHUNK_SIZE when it is not known. */
read_size = size;
if (read_size > SANE_CHUNK_SIZE/10) {
read_size = ffio_limit(s, read_size);
// If filesize/maxsize is unknown, limit to SANE_CHUNK_SIZE
if (ffiocontext(s)->maxsize < 0)
read_size = FFMIN(read_size, SANE_CHUNK_SIZE);
}
ret = av_grow_packet(pkt, read_size);
if (ret < 0)
break;
ret = avio_read(s, pkt->data + prev_size, read_size);
if (ret != read_size) {
av_shrink_packet(pkt, prev_size + FFMAX(ret, 0));
break;
}
size -= read_size;
} while (size > 0);
if (size > 0)
pkt->flags |= AV_PKT_FLAG_CORRUPT;
if (!pkt->size)
av_packet_unref(pkt);
return pkt->size > orig_size ? pkt->size - orig_size : ret;
}
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
{
#if FF_API_INIT_PACKET
FF_DISABLE_DEPRECATION_WARNINGS
av_init_packet(pkt);
pkt->data = NULL;
pkt->size = 0;
FF_ENABLE_DEPRECATION_WARNINGS
#else
av_packet_unref(pkt);
#endif
pkt->pos = avio_tell(s);
return append_packet_chunked(s, pkt, size);
}
int av_append_packet(AVIOContext *s, AVPacket *pkt, int size)
{
if (!pkt->size)
return av_get_packet(s, pkt, size);
return append_packet_chunked(s, pkt, size);
}
int av_filename_number_test(const char *filename)
{
char buf[1024];
return filename &&
(av_get_frame_filename(buf, sizeof(buf), filename, 1) >= 0);
}
/**********************************************************/
int ff_is_intra_only(enum AVCodecID id)
{
const AVCodecDescriptor *d = avcodec_descriptor_get(id);
if (!d)
return 0;
if ((d->type == AVMEDIA_TYPE_VIDEO || d->type == AVMEDIA_TYPE_AUDIO) &&
!(d->props & AV_CODEC_PROP_INTRA_ONLY))
return 0;
return 1;
}
int av_find_default_stream_index(AVFormatContext *s)
{
int best_stream = 0;
int best_score = INT_MIN;
if (s->nb_streams <= 0)
return -1;
for (unsigned i = 0; i < s->nb_streams; i++) {
const AVStream *const st = s->streams[i];
const FFStream *const sti = cffstream(st);
int score = 0;
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
if (st->disposition & AV_DISPOSITION_ATTACHED_PIC)
score -= 400;
if (st->codecpar->width && st->codecpar->height)
score += 50;
score+= 25;
}
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
if (st->codecpar->sample_rate)
score += 50;
}
if (sti->codec_info_nb_frames)
score += 12;
if (st->discard != AVDISCARD_ALL)
score += 200;
if (score > best_score) {
best_score = score;
best_stream = i;
}
}
return best_stream;
}
/*******************************************************/
unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
{
while (tags->id != AV_CODEC_ID_NONE) {
if (tags->id == id)
return tags->tag;
tags++;
}
return 0;
}
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
{
for (int i = 0; tags[i].id != AV_CODEC_ID_NONE; i++)
if (tag == tags[i].tag)
return tags[i].id;
for (int i = 0; tags[i].id != AV_CODEC_ID_NONE; i++)
if (ff_toupper4(tag) == ff_toupper4(tags[i].tag))
return tags[i].id;
return AV_CODEC_ID_NONE;
}
enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags)
{
if (bps <= 0 || bps > 64)
return AV_CODEC_ID_NONE;
if (flt) {
switch (bps) {
case 32:
return be ? AV_CODEC_ID_PCM_F32BE : AV_CODEC_ID_PCM_F32LE;
case 64:
return be ? AV_CODEC_ID_PCM_F64BE : AV_CODEC_ID_PCM_F64LE;
default:
return AV_CODEC_ID_NONE;
}
} else {
bps += 7;
bps >>= 3;
if (sflags & (1 << (bps - 1))) {
switch (bps) {
case 1:
return AV_CODEC_ID_PCM_S8;
case 2:
return be ? AV_CODEC_ID_PCM_S16BE : AV_CODEC_ID_PCM_S16LE;
case 3:
return be ? AV_CODEC_ID_PCM_S24BE : AV_CODEC_ID_PCM_S24LE;
case 4:
return be ? AV_CODEC_ID_PCM_S32BE : AV_CODEC_ID_PCM_S32LE;
case 8:
return be ? AV_CODEC_ID_PCM_S64BE : AV_CODEC_ID_PCM_S64LE;
default:
return AV_CODEC_ID_NONE;
}
} else {
switch (bps) {
case 1:
return AV_CODEC_ID_PCM_U8;
case 2:
return be ? AV_CODEC_ID_PCM_U16BE : AV_CODEC_ID_PCM_U16LE;
case 3:
return be ? AV_CODEC_ID_PCM_U24BE : AV_CODEC_ID_PCM_U24LE;
case 4:
return be ? AV_CODEC_ID_PCM_U32BE : AV_CODEC_ID_PCM_U32LE;
default:
return AV_CODEC_ID_NONE;
}
}
}
}
unsigned int av_codec_get_tag(const AVCodecTag *const *tags, enum AVCodecID id)
{
unsigned int tag;
if (!av_codec_get_tag2(tags, id, &tag))
return 0;
return tag;
}
int av_codec_get_tag2(const AVCodecTag * const *tags, enum AVCodecID id,
unsigned int *tag)
{
for (int i = 0; tags && tags[i]; i++) {
const AVCodecTag *codec_tags = tags[i];
while (codec_tags->id != AV_CODEC_ID_NONE) {
if (codec_tags->id == id) {
*tag = codec_tags->tag;
return 1;
}
codec_tags++;
}
}
return 0;
}
enum AVCodecID av_codec_get_id(const AVCodecTag *const *tags, unsigned int tag)
{
for (int i = 0; tags && tags[i]; i++) {
enum AVCodecID id = ff_codec_get_id(tags[i], tag);
if (id != AV_CODEC_ID_NONE)
return id;
}
return AV_CODEC_ID_NONE;
}
int ff_alloc_extradata(AVCodecParameters *par, int size)
{
av_freep(&par->extradata);
par->extradata_size = 0;
if (size < 0 || size >= INT32_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
return AVERROR(EINVAL);
par->extradata = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!par->extradata)
return AVERROR(ENOMEM);
memset(par->extradata + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
par->extradata_size = size;
return 0;
}
AVProgram *av_find_program_from_stream(AVFormatContext *ic, AVProgram *last, int s)
{
for (unsigned i = 0; i < ic->nb_programs; i++) {
if (ic->programs[i] == last) {
last = NULL;
} else {
if (!last)
for (unsigned j = 0; j < ic->programs[i]->nb_stream_indexes; j++)
if (ic->programs[i]->stream_index[j] == s)
return ic->programs[i];
}
}
return NULL;
}
int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type,
int wanted_stream_nb, int related_stream,
const AVCodec **decoder_ret, int flags)
{
int nb_streams = ic->nb_streams;
int ret = AVERROR_STREAM_NOT_FOUND;
int best_count = -1, best_multiframe = -1, best_disposition = -1;
int count, multiframe, disposition;
int64_t best_bitrate = -1;
int64_t bitrate;
unsigned *program = NULL;
const AVCodec *decoder = NULL, *best_decoder = NULL;
if (related_stream >= 0 && wanted_stream_nb < 0) {
AVProgram *p = av_find_program_from_stream(ic, NULL, related_stream);
if (p) {
program = p->stream_index;
nb_streams = p->nb_stream_indexes;
}
}
for (unsigned i = 0; i < nb_streams; i++) {
int real_stream_index = program ? program[i] : i;
AVStream *st = ic->streams[real_stream_index];
AVCodecParameters *par = st->codecpar;
if (par->codec_type != type)
continue;
if (wanted_stream_nb >= 0 && real_stream_index != wanted_stream_nb)
continue;
if (type == AVMEDIA_TYPE_AUDIO && !(par->ch_layout.nb_channels && par->sample_rate))
continue;
if (decoder_ret) {
decoder = ff_find_decoder(ic, st, par->codec_id);
if (!decoder) {
if (ret < 0)
ret = AVERROR_DECODER_NOT_FOUND;
continue;
}
}
disposition = !(st->disposition & (AV_DISPOSITION_HEARING_IMPAIRED | AV_DISPOSITION_VISUAL_IMPAIRED))
+ !! (st->disposition & AV_DISPOSITION_DEFAULT);
count = ffstream(st)->codec_info_nb_frames;
bitrate = par->bit_rate;
multiframe = FFMIN(5, count);
if ((best_disposition > disposition) ||
(best_disposition == disposition && best_multiframe > multiframe) ||
(best_disposition == disposition && best_multiframe == multiframe && best_bitrate > bitrate) ||
(best_disposition == disposition && best_multiframe == multiframe && best_bitrate == bitrate && best_count >= count))
continue;
best_disposition = disposition;
best_count = count;
best_bitrate = bitrate;
best_multiframe = multiframe;
ret = real_stream_index;
best_decoder = decoder;
if (program && i == nb_streams - 1 && ret < 0) {
program = NULL;
nb_streams = ic->nb_streams;
/* no related stream found, try again with everything */
i = 0;
}
}
if (decoder_ret)
*decoder_ret = best_decoder;
return ret;
}
/*******************************************************/
int ff_stream_side_data_copy(AVStream *dst, const AVStream *src)
{
/* Free existing side data*/
for (int i = 0; i < dst->nb_side_data; i++)
av_free(dst->side_data[i].data);
av_freep(&dst->side_data);
dst->nb_side_data = 0;
/* Copy side data if present */
if (src->nb_side_data) {
dst->side_data = av_calloc(src->nb_side_data,
sizeof(*dst->side_data));
if (!dst->side_data)
return AVERROR(ENOMEM);
dst->nb_side_data = src->nb_side_data;
for (int i = 0; i < src->nb_side_data; i++) {
uint8_t *data = av_memdup(src->side_data[i].data,
src->side_data[i].size);
if (!data)
return AVERROR(ENOMEM);
dst->side_data[i].type = src->side_data[i].type;
dst->side_data[i].size = src->side_data[i].size;
dst->side_data[i].data = data;
}
}
return 0;
}
uint64_t ff_ntp_time(void)
{
return (av_gettime() / 1000) * 1000 + NTP_OFFSET_US;
}
uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us)
{
uint64_t ntp_ts, frac_part, sec;
uint32_t usec;
//current ntp time in seconds and micro seconds
sec = ntp_time_us / 1000000;
usec = ntp_time_us % 1000000;
//encoding in ntp timestamp format
frac_part = usec * 0xFFFFFFFFULL;
frac_part /= 1000000;
if (sec > 0xFFFFFFFFULL)
av_log(NULL, AV_LOG_WARNING, "NTP time format roll over detected\n");
ntp_ts = sec << 32;
ntp_ts |= frac_part;
return ntp_ts;
}
uint64_t ff_parse_ntp_time(uint64_t ntp_ts)
{
uint64_t sec = ntp_ts >> 32;
uint64_t frac_part = ntp_ts & 0xFFFFFFFFULL;
uint64_t usec = (frac_part * 1000000) / 0xFFFFFFFFULL;
return (sec * 1000000) + usec;
}
int av_get_frame_filename2(char *buf, int buf_size, const char *path, int number, int flags)
{
const char *p;
char *q, buf1[20], c;
int nd, len, percentd_found;
q = buf;
p = path;
percentd_found = 0;
for (;;) {
c = *p++;
if (c == '\0')
break;
if (c == '%') {
do {
nd = 0;
while (av_isdigit(*p)) {
if (nd >= INT_MAX / 10 - 255)
goto fail;
nd = nd * 10 + *p++ - '0';
}
c = *p++;
} while (av_isdigit(c));
switch (c) {
case '%':
goto addchar;
case 'd':
if (!(flags & AV_FRAME_FILENAME_FLAGS_MULTIPLE) && percentd_found)
goto fail;
percentd_found = 1;
if (number < 0)
nd += 1;
snprintf(buf1, sizeof(buf1), "%0*d", nd, number);
len = strlen(buf1);
if ((q - buf + len) > buf_size - 1)
goto fail;
memcpy(q, buf1, len);
q += len;
break;
default:
goto fail;
}
} else {
addchar:
if ((q - buf) < buf_size - 1)
*q++ = c;
}
}
if (!percentd_found)
goto fail;
*q = '\0';
return 0;
fail:
*q = '\0';
return -1;
}
int av_get_frame_filename(char *buf, int buf_size, const char *path, int number)
{
return av_get_frame_filename2(buf, buf_size, path, number, 0);
}
void av_url_split(char *proto, int proto_size,
char *authorization, int authorization_size,
char *hostname, int hostname_size,
int *port_ptr, char *path, int path_size, const char *url)
{
const char *p, *ls, *at, *at2, *col, *brk;
if (port_ptr)
*port_ptr = -1;
if (proto_size > 0)
proto[0] = 0;
if (authorization_size > 0)
authorization[0] = 0;
if (hostname_size > 0)
hostname[0] = 0;
if (path_size > 0)
path[0] = 0;
/* parse protocol */
if ((p = strchr(url, ':'))) {
av_strlcpy(proto, url, FFMIN(proto_size, p + 1 - url));
p++; /* skip ':' */
if (*p == '/')
p++;
if (*p == '/')
p++;
} else {
/* no protocol means plain filename */
av_strlcpy(path, url, path_size);
return;
}
/* separate path from hostname */
ls = p + strcspn(p, "/?#");
av_strlcpy(path, ls, path_size);
/* the rest is hostname, use that to parse auth/port */
if (ls != p) {
/* authorization (user[:pass]@hostname) */
at2 = p;
while ((at = strchr(p, '@')) && at < ls) {
av_strlcpy(authorization, at2,
FFMIN(authorization_size, at + 1 - at2));
p = at + 1; /* skip '@' */
}
if (*p == '[' && (brk = strchr(p, ']')) && brk < ls) {
/* [host]:port */
av_strlcpy(hostname, p + 1,
FFMIN(hostname_size, brk - p));
if (brk[1] == ':' && port_ptr)
*port_ptr = atoi(brk + 2);
} else if ((col = strchr(p, ':')) && col < ls) {
av_strlcpy(hostname, p,
FFMIN(col + 1 - p, hostname_size));
if (port_ptr)
*port_ptr = atoi(col + 1);
} else
av_strlcpy(hostname, p,
FFMIN(ls + 1 - p, hostname_size));
}
}
int ff_mkdir_p(const char *path)
{
int ret = 0;
char *temp = av_strdup(path);
char *pos = temp;
char tmp_ch = '\0';
if (!path || !temp) {
return -1;
}
if (!av_strncasecmp(temp, "/", 1) || !av_strncasecmp(temp, "\\", 1)) {
pos++;
} else if (!av_strncasecmp(temp, "./", 2) || !av_strncasecmp(temp, ".\\", 2)) {
pos += 2;
}
for ( ; *pos != '\0'; ++pos) {
if (*pos == '/' || *pos == '\\') {
tmp_ch = *pos;
*pos = '\0';
ret = mkdir(temp, 0755);
*pos = tmp_ch;
}
}
if ((*(pos - 1) != '/') && (*(pos - 1) != '\\')) {
ret = mkdir(temp, 0755);
}
av_free(temp);
return ret;
}
char *ff_data_to_hex(char *buff, const uint8_t *src, int s, int lowercase)
{
static const char hex_table_uc[16] = { '0', '1', '2', '3',
'4', '5', '6', '7',
'8', '9', 'A', 'B',
'C', 'D', 'E', 'F' };
static const char hex_table_lc[16] = { '0', '1', '2', '3',
'4', '5', '6', '7',
'8', '9', 'a', 'b',
'c', 'd', 'e', 'f' };
const char *hex_table = lowercase ? hex_table_lc : hex_table_uc;
for (int i = 0; i < s; i++) {
buff[i * 2] = hex_table[src[i] >> 4];
buff[i * 2 + 1] = hex_table[src[i] & 0xF];
}
buff[2 * s] = '\0';
return buff;
}
int ff_hex_to_data(uint8_t *data, const char *p)
{
int c, len, v;
len = 0;
v = 1;
for (;;) {
p += strspn(p, SPACE_CHARS);
if (*p == '\0')
break;
c = av_toupper((unsigned char) *p++);
if (c >= '0' && c <= '9')
c = c - '0';
else if (c >= 'A' && c <= 'F')
c = c - 'A' + 10;
else
break;
v = (v << 4) | c;
if (v & 0x100) {
if (data)
data[len] = v;
len++;
v = 1;
}
}
return len;
}
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits,
unsigned int pts_num, unsigned int pts_den)
{
FFStream *const sti = ffstream(st);
AVRational new_tb;
if (av_reduce(&new_tb.num, &new_tb.den, pts_num, pts_den, INT_MAX)) {
if (new_tb.num != pts_num)
av_log(NULL, AV_LOG_DEBUG,
"st:%d removing common factor %d from timebase\n",
st->index, pts_num / new_tb.num);
} else
av_log(NULL, AV_LOG_WARNING,
"st:%d has too large timebase, reducing\n", st->index);
if (new_tb.num <= 0 || new_tb.den <= 0) {
av_log(NULL, AV_LOG_ERROR,
"Ignoring attempt to set invalid timebase %d/%d for st:%d\n",
new_tb.num, new_tb.den,
st->index);
return;
}
st->time_base = new_tb;
sti->avctx->pkt_timebase = new_tb;
st->pts_wrap_bits = pts_wrap_bits;
}
void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
void *context)
{
const char *ptr = str;
/* Parse key=value pairs. */
for (;;) {
const char *key;
char *dest = NULL, *dest_end;
int key_len, dest_len = 0;
/* Skip whitespace and potential commas. */
while (*ptr && (av_isspace(*ptr) || *ptr == ','))
ptr++;
if (!*ptr)
break;
key = ptr;
if (!(ptr = strchr(key, '=')))
break;
ptr++;
key_len = ptr - key;
callback_get_buf(context, key, key_len, &dest, &dest_len);
dest_end = dest ? dest + dest_len - 1 : NULL;
if (*ptr == '\"') {
ptr++;
while (*ptr && *ptr != '\"') {
if (*ptr == '\\') {
if (!ptr[1])
break;
if (dest && dest < dest_end)
*dest++ = ptr[1];
ptr += 2;
} else {
if (dest && dest < dest_end)
*dest++ = *ptr;
ptr++;
}
}
if (*ptr == '\"')
ptr++;
} else {
for (; *ptr && !(av_isspace(*ptr) || *ptr == ','); ptr++)
if (dest && dest < dest_end)
*dest++ = *ptr;
}
if (dest)
*dest = 0;
}
}
int ff_find_stream_index(const AVFormatContext *s, int id)
{
for (unsigned i = 0; i < s->nb_streams; i++)
if (s->streams[i]->id == id)
return i;
return -1;
}
int avformat_network_init(void)
{
#if CONFIG_NETWORK
int ret;
if ((ret = ff_network_init()) < 0)
return ret;
if ((ret = ff_tls_init()) < 0)
return ret;
#endif
return 0;
}
int avformat_network_deinit(void)
{
#if CONFIG_NETWORK
ff_network_close();
ff_tls_deinit();
#endif
return 0;
}
AVRational av_guess_sample_aspect_ratio(AVFormatContext *format, AVStream *stream, AVFrame *frame)
{
AVRational undef = {0, 1};
AVRational stream_sample_aspect_ratio = stream ? stream->sample_aspect_ratio : undef;
AVRational codec_sample_aspect_ratio = stream && stream->codecpar ? stream->codecpar->sample_aspect_ratio : undef;
AVRational frame_sample_aspect_ratio = frame ? frame->sample_aspect_ratio : codec_sample_aspect_ratio;
av_reduce(&stream_sample_aspect_ratio.num, &stream_sample_aspect_ratio.den,
stream_sample_aspect_ratio.num, stream_sample_aspect_ratio.den, INT_MAX);
if (stream_sample_aspect_ratio.num <= 0 || stream_sample_aspect_ratio.den <= 0)
stream_sample_aspect_ratio = undef;
av_reduce(&frame_sample_aspect_ratio.num, &frame_sample_aspect_ratio.den,
frame_sample_aspect_ratio.num, frame_sample_aspect_ratio.den, INT_MAX);
if (frame_sample_aspect_ratio.num <= 0 || frame_sample_aspect_ratio.den <= 0)
frame_sample_aspect_ratio = undef;
if (stream_sample_aspect_ratio.num)
return stream_sample_aspect_ratio;
else
return frame_sample_aspect_ratio;
}
AVRational av_guess_frame_rate(AVFormatContext *format, AVStream *st, AVFrame *frame)
{
AVRational fr = st->r_frame_rate;
AVCodecContext *const avctx = ffstream(st)->avctx;
AVRational codec_fr = avctx->framerate;
AVRational avg_fr = st->avg_frame_rate;
if (avg_fr.num > 0 && avg_fr.den > 0 && fr.num > 0 && fr.den > 0 &&
av_q2d(avg_fr) < 70 && av_q2d(fr) > 210) {
fr = avg_fr;
}
if (avctx->ticks_per_frame > 1) {
if ( codec_fr.num > 0 && codec_fr.den > 0 &&
(fr.num == 0 || av_q2d(codec_fr) < av_q2d(fr)*0.7 && fabs(1.0 - av_q2d(av_div_q(avg_fr, fr))) > 0.1))
fr = codec_fr;
}
return fr;
}
/**
* Matches a stream specifier (but ignores requested index).
*
* @param indexptr set to point to the requested stream index if there is one
*
* @return <0 on error
* 0 if st is NOT a matching stream
* >0 if st is a matching stream
*/
static int match_stream_specifier(const AVFormatContext *s, const AVStream *st,
const char *spec, const char **indexptr,
const AVProgram **p)
{
int match = 1; /* Stores if the specifier matches so far. */
while (*spec) {
if (*spec <= '9' && *spec >= '0') { /* opt:index */
if (indexptr)
*indexptr = spec;
return match;
} else if (*spec == 'v' || *spec == 'a' || *spec == 's' || *spec == 'd' ||
*spec == 't' || *spec == 'V') { /* opt:[vasdtV] */
enum AVMediaType type;
int nopic = 0;
switch (*spec++) {
case 'v': type = AVMEDIA_TYPE_VIDEO; break;
case 'a': type = AVMEDIA_TYPE_AUDIO; break;
case 's': type = AVMEDIA_TYPE_SUBTITLE; break;
case 'd': type = AVMEDIA_TYPE_DATA; break;
case 't': type = AVMEDIA_TYPE_ATTACHMENT; break;
case 'V': type = AVMEDIA_TYPE_VIDEO; nopic = 1; break;
default: av_assert0(0);
}
if (*spec && *spec++ != ':') /* If we are not at the end, then another specifier must follow. */
return AVERROR(EINVAL);
if (type != st->codecpar->codec_type)
match = 0;
if (nopic && (st->disposition & AV_DISPOSITION_ATTACHED_PIC))
match = 0;
} else if (*spec == 'p' && *(spec + 1) == ':') {
int prog_id;
int found = 0;
char *endptr;
spec += 2;
prog_id = strtol(spec, &endptr, 0);
/* Disallow empty id and make sure that if we are not at the end, then another specifier must follow. */
if (spec == endptr || (*endptr && *endptr++ != ':'))
return AVERROR(EINVAL);
spec = endptr;
if (match) {
for (unsigned i = 0; i < s->nb_programs; i++) {
if (s->programs[i]->id != prog_id)
continue;
for (unsigned j = 0; j < s->programs[i]->nb_stream_indexes; j++) {
if (st->index == s->programs[i]->stream_index[j]) {
found = 1;
if (p)
*p = s->programs[i];
i = s->nb_programs;
break;
}
}
}
}
if (!found)
match = 0;
} else if (*spec == '#' ||
(*spec == 'i' && *(spec + 1) == ':')) {
int stream_id;
char *endptr;
spec += 1 + (*spec == 'i');
stream_id = strtol(spec, &endptr, 0);
if (spec == endptr || *endptr) /* Disallow empty id and make sure we are at the end. */
return AVERROR(EINVAL);
return match && (stream_id == st->id);
} else if (*spec == 'm' && *(spec + 1) == ':') {
const AVDictionaryEntry *tag;
char *key, *val;
int ret;
if (match) {
spec += 2;
val = strchr(spec, ':');
key = val ? av_strndup(spec, val - spec) : av_strdup(spec);
if (!key)
return AVERROR(ENOMEM);
tag = av_dict_get(st->metadata, key, NULL, 0);
if (tag) {
if (!val || !strcmp(tag->value, val + 1))
ret = 1;
else
ret = 0;
} else
ret = 0;
av_freep(&key);
}
return match && ret;
} else if (*spec == 'u' && *(spec + 1) == '\0') {
const AVCodecParameters *par = st->codecpar;
int val;
switch (par->codec_type) {
case AVMEDIA_TYPE_AUDIO:
val = par->sample_rate && par->ch_layout.nb_channels;
if (par->format == AV_SAMPLE_FMT_NONE)
return 0;
break;
case AVMEDIA_TYPE_VIDEO:
val = par->width && par->height;
if (par->format == AV_PIX_FMT_NONE)
return 0;
break;
case AVMEDIA_TYPE_UNKNOWN:
val = 0;
break;
default:
val = 1;
break;
}
return match && (par->codec_id != AV_CODEC_ID_NONE && val != 0);
} else {
return AVERROR(EINVAL);
}
}
return match;
}
int avformat_match_stream_specifier(AVFormatContext *s, AVStream *st,
const char *spec)
{
int ret, index;
char *endptr;
const char *indexptr = NULL;
const AVProgram *p = NULL;
int nb_streams;
ret = match_stream_specifier(s, st, spec, &indexptr, &p);
if (ret < 0)
goto error;
if (!indexptr)
return ret;
index = strtol(indexptr, &endptr, 0);
if (*endptr) { /* We can't have anything after the requested index. */
ret = AVERROR(EINVAL);
goto error;
}
/* This is not really needed but saves us a loop for simple stream index specifiers. */
if (spec == indexptr)
return (index == st->index);
/* If we requested a matching stream index, we have to ensure st is that. */
nb_streams = p ? p->nb_stream_indexes : s->nb_streams;
for (int i = 0; i < nb_streams && index >= 0; i++) {
const AVStream *candidate = s->streams[p ? p->stream_index[i] : i];
ret = match_stream_specifier(s, candidate, spec, NULL, NULL);
if (ret < 0)
goto error;
if (ret > 0 && index-- == 0 && st == candidate)
return 1;
}
return 0;
error:
if (ret == AVERROR(EINVAL))
av_log(s, AV_LOG_ERROR, "Invalid stream specifier: %s.\n", spec);
return ret;
}
void ff_format_io_close_default(AVFormatContext *s, AVIOContext *pb)
{
avio_close(pb);
}
int ff_format_io_close(AVFormatContext *s, AVIOContext **pb)
{
int ret = 0;
if (*pb) {
if (s->io_close == ff_format_io_close_default || s->io_close == NULL)
ret = s->io_close2(s, *pb);
else
s->io_close(s, *pb);
}
*pb = NULL;
return ret;
}
int ff_is_http_proto(const char *filename) {
const char *proto = avio_find_protocol_name(filename);
return proto ? (!av_strcasecmp(proto, "http") || !av_strcasecmp(proto, "https")) : 0;
}
int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf)
{
int ret;
char *str;
ret = av_bprint_finalize(buf, &str);
if (ret < 0)
return ret;
if (!av_bprint_is_complete(buf)) {
av_free(str);
return AVERROR(ENOMEM);
}
par->extradata = str;
/* Note: the string is NUL terminated (so extradata can be read as a
* string), but the ending character is not accounted in the size (in
* binary formats you are likely not supposed to mux that character). When
* extradata is copied, it is also padded with AV_INPUT_BUFFER_PADDING_SIZE
* zeros. */
par->extradata_size = buf->len;
return 0;
}
void ff_format_set_url(AVFormatContext *s, char *url)
{
av_assert0(url);
av_freep(&s->url);
s->url = url;
}
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