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ffmpeg/libavformat/concatdec.c

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/*
* Copyright (c) 2012 Nicolas George
*
* 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/avstring.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "avformat.h"
#include "internal.h"
#include "url.h"
typedef enum ConcatMatchMode {
MATCH_ONE_TO_ONE,
MATCH_EXACT_ID,
} ConcatMatchMode;
typedef struct ConcatStream {
AVBitStreamFilterContext *bsf;
int out_stream_index;
} ConcatStream;
typedef struct {
char *url;
int64_t start_time;
int64_t duration;
ConcatStream *streams;
int nb_streams;
} ConcatFile;
typedef struct {
AVClass *class;
ConcatFile *files;
ConcatFile *cur_file;
unsigned nb_files;
AVFormatContext *avf;
int safe;
int seekable;
ConcatMatchMode stream_match_mode;
unsigned auto_convert;
} ConcatContext;
static int concat_probe(AVProbeData *probe)
{
return memcmp(probe->buf, "ffconcat version 1.0", 20) ?
0 : AVPROBE_SCORE_MAX;
}
static char *get_keyword(uint8_t **cursor)
{
char *ret = *cursor += strspn(*cursor, SPACE_CHARS);
*cursor += strcspn(*cursor, SPACE_CHARS);
if (**cursor) {
*((*cursor)++) = 0;
*cursor += strspn(*cursor, SPACE_CHARS);
}
return ret;
}
static int safe_filename(const char *f)
{
const char *start = f;
for (; *f; f++) {
/* A-Za-z0-9_- */
if (!((unsigned)((*f | 32) - 'a') < 26 ||
(unsigned)(*f - '0') < 10 || *f == '_' || *f == '-')) {
if (f == start)
return 0;
else if (*f == '/')
start = f + 1;
else if (*f != '.')
return 0;
}
}
return 1;
}
#define FAIL(retcode) do { ret = (retcode); goto fail; } while(0)
static int add_file(AVFormatContext *avf, char *filename, ConcatFile **rfile,
unsigned *nb_files_alloc)
{
ConcatContext *cat = avf->priv_data;
ConcatFile *file;
char *url = NULL;
const char *proto;
size_t url_len, proto_len;
int ret;
if (cat->safe > 0 && !safe_filename(filename)) {
av_log(avf, AV_LOG_ERROR, "Unsafe file name '%s'\n", filename);
FAIL(AVERROR(EPERM));
}
proto = avio_find_protocol_name(filename);
proto_len = proto ? strlen(proto) : 0;
if (!memcmp(filename, proto, proto_len) &&
(filename[proto_len] == ':' || filename[proto_len] == ',')) {
url = filename;
filename = NULL;
} else {
url_len = strlen(avf->filename) + strlen(filename) + 16;
if (!(url = av_malloc(url_len)))
FAIL(AVERROR(ENOMEM));
ff_make_absolute_url(url, url_len, avf->filename, filename);
av_freep(&filename);
}
if (cat->nb_files >= *nb_files_alloc) {
size_t n = FFMAX(*nb_files_alloc * 2, 16);
ConcatFile *new_files;
if (n <= cat->nb_files || n > SIZE_MAX / sizeof(*cat->files) ||
!(new_files = av_realloc(cat->files, n * sizeof(*cat->files))))
FAIL(AVERROR(ENOMEM));
cat->files = new_files;
*nb_files_alloc = n;
}
file = &cat->files[cat->nb_files++];
memset(file, 0, sizeof(*file));
*rfile = file;
file->url = url;
file->start_time = AV_NOPTS_VALUE;
file->duration = AV_NOPTS_VALUE;
return 0;
fail:
av_free(url);
av_free(filename);
return ret;
}
static int copy_stream_props(AVStream *st, AVStream *source_st)
{
int ret;
if (st->codec->codec_id || !source_st->codec->codec_id) {
if (st->codec->extradata_size < source_st->codec->extradata_size) {
ret = ff_alloc_extradata(st->codec,
source_st->codec->extradata_size);
if (ret < 0)
return ret;
}
memcpy(st->codec->extradata, source_st->codec->extradata,
source_st->codec->extradata_size);
return 0;
}
if ((ret = avcodec_copy_context(st->codec, source_st->codec)) < 0)
return ret;
st->r_frame_rate = source_st->r_frame_rate;
st->avg_frame_rate = source_st->avg_frame_rate;
st->time_base = source_st->time_base;
st->sample_aspect_ratio = source_st->sample_aspect_ratio;
return 0;
}
static int detect_stream_specific(AVFormatContext *avf, int idx)
{
ConcatContext *cat = avf->priv_data;
AVStream *st = cat->avf->streams[idx];
ConcatStream *cs = &cat->cur_file->streams[idx];
AVBitStreamFilterContext *bsf;
if (cat->auto_convert && st->codec->codec_id == AV_CODEC_ID_H264 &&
(st->codec->extradata_size < 4 || AV_RB32(st->codec->extradata) != 1)) {
av_log(cat->avf, AV_LOG_INFO,
"Auto-inserting h264_mp4toannexb bitstream filter\n");
if (!(bsf = av_bitstream_filter_init("h264_mp4toannexb"))) {
av_log(avf, AV_LOG_ERROR, "h264_mp4toannexb bitstream filter "
"required for H.264 streams\n");
return AVERROR_BSF_NOT_FOUND;
}
cs->bsf = bsf;
}
return 0;
}
static int match_streams_one_to_one(AVFormatContext *avf)
{
ConcatContext *cat = avf->priv_data;
AVStream *st;
int i, ret;
for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) {
if (i < avf->nb_streams) {
st = avf->streams[i];
} else {
if (!(st = avformat_new_stream(avf, NULL)))
return AVERROR(ENOMEM);
}
if ((ret = copy_stream_props(st, cat->avf->streams[i])) < 0)
return ret;
cat->cur_file->streams[i].out_stream_index = i;
}
return 0;
}
static int match_streams_exact_id(AVFormatContext *avf)
{
ConcatContext *cat = avf->priv_data;
AVStream *st;
int i, j, ret;
for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++) {
st = cat->avf->streams[i];
for (j = 0; j < avf->nb_streams; j++) {
if (avf->streams[j]->id == st->id) {
av_log(avf, AV_LOG_VERBOSE,
"Match slave stream #%d with stream #%d id 0x%x\n",
i, j, st->id);
if ((ret = copy_stream_props(avf->streams[j], st)) < 0)
return ret;
cat->cur_file->streams[i].out_stream_index = j;
}
}
}
return 0;
}
static int match_streams(AVFormatContext *avf)
{
ConcatContext *cat = avf->priv_data;
ConcatStream *map;
int i, ret;
if (cat->cur_file->nb_streams >= cat->avf->nb_streams)
return 0;
map = av_realloc(cat->cur_file->streams,
cat->avf->nb_streams * sizeof(*map));
if (!map)
return AVERROR(ENOMEM);
cat->cur_file->streams = map;
memset(map + cat->cur_file->nb_streams, 0,
(cat->avf->nb_streams - cat->cur_file->nb_streams) * sizeof(*map));
for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++)
map[i].out_stream_index = -1;
switch (cat->stream_match_mode) {
case MATCH_ONE_TO_ONE:
ret = match_streams_one_to_one(avf);
break;
case MATCH_EXACT_ID:
ret = match_streams_exact_id(avf);
break;
default:
ret = AVERROR_BUG;
}
if (ret < 0)
return ret;
for (i = cat->cur_file->nb_streams; i < cat->avf->nb_streams; i++)
if ((ret = detect_stream_specific(avf, i)) < 0)
return ret;
cat->cur_file->nb_streams = cat->avf->nb_streams;
return 0;
}
static int open_file(AVFormatContext *avf, unsigned fileno)
{
ConcatContext *cat = avf->priv_data;
ConcatFile *file = &cat->files[fileno];
int ret;
if (cat->avf)
avformat_close_input(&cat->avf);
cat->avf = avformat_alloc_context();
if (!cat->avf)
return AVERROR(ENOMEM);
cat->avf->interrupt_callback = avf->interrupt_callback;
av_assert0(!cat->avf->codec_whitelist && !cat->avf->format_whitelist);
cat->avf-> codec_whitelist = av_strdup(avf->codec_whitelist);
cat->avf->format_whitelist = av_strdup(avf->format_whitelist);
if ((ret = avformat_open_input(&cat->avf, file->url, NULL, NULL)) < 0 ||
(ret = avformat_find_stream_info(cat->avf, NULL)) < 0) {
av_log(avf, AV_LOG_ERROR, "Impossible to open '%s'\n", file->url);
avformat_close_input(&cat->avf);
return ret;
}
cat->cur_file = file;
if (file->start_time == AV_NOPTS_VALUE)
file->start_time = !fileno ? 0 :
cat->files[fileno - 1].start_time +
cat->files[fileno - 1].duration;
if ((ret = match_streams(avf)) < 0)
return ret;
return 0;
}
static int concat_read_close(AVFormatContext *avf)
{
ConcatContext *cat = avf->priv_data;
unsigned i;
if (cat->avf)
avformat_close_input(&cat->avf);
for (i = 0; i < cat->nb_files; i++) {
av_freep(&cat->files[i].url);
av_freep(&cat->files[i].streams);
}
av_freep(&cat->files);
return 0;
}
static int concat_read_header(AVFormatContext *avf)
{
ConcatContext *cat = avf->priv_data;
uint8_t buf[4096];
uint8_t *cursor, *keyword;
int ret, line = 0, i;
unsigned nb_files_alloc = 0;
ConcatFile *file = NULL;
int64_t time = 0;
while (1) {
if ((ret = ff_get_line(avf->pb, buf, sizeof(buf))) <= 0)
break;
line++;
cursor = buf;
keyword = get_keyword(&cursor);
if (!*keyword || *keyword == '#')
continue;
if (!strcmp(keyword, "file")) {
char *filename = av_get_token((const char **)&cursor, SPACE_CHARS);
if (!filename) {
av_log(avf, AV_LOG_ERROR, "Line %d: filename required\n", line);
FAIL(AVERROR_INVALIDDATA);
}
if ((ret = add_file(avf, filename, &file, &nb_files_alloc)) < 0)
goto fail;
} else if (!strcmp(keyword, "duration")) {
char *dur_str = get_keyword(&cursor);
int64_t dur;
if (!file) {
av_log(avf, AV_LOG_ERROR, "Line %d: duration without file\n",
line);
FAIL(AVERROR_INVALIDDATA);
}
if ((ret = av_parse_time(&dur, dur_str, 1)) < 0) {
av_log(avf, AV_LOG_ERROR, "Line %d: invalid duration '%s'\n",
line, dur_str);
goto fail;
}
file->duration = dur;
} else if (!strcmp(keyword, "stream")) {
if (!avformat_new_stream(avf, NULL))
FAIL(AVERROR(ENOMEM));
} else if (!strcmp(keyword, "exact_stream_id")) {
if (!avf->nb_streams) {
av_log(avf, AV_LOG_ERROR, "Line %d: exact_stream_id without stream\n",
line);
FAIL(AVERROR_INVALIDDATA);
}
avf->streams[avf->nb_streams - 1]->id =
strtol(get_keyword(&cursor), NULL, 0);
} else if (!strcmp(keyword, "ffconcat")) {
char *ver_kw = get_keyword(&cursor);
char *ver_val = get_keyword(&cursor);
if (strcmp(ver_kw, "version") || strcmp(ver_val, "1.0")) {
av_log(avf, AV_LOG_ERROR, "Line %d: invalid version\n", line);
FAIL(AVERROR_INVALIDDATA);
}
if (cat->safe < 0)
cat->safe = 1;
} else {
av_log(avf, AV_LOG_ERROR, "Line %d: unknown keyword '%s'\n",
line, keyword);
FAIL(AVERROR_INVALIDDATA);
}
}
if (ret < 0)
goto fail;
if (!cat->nb_files)
FAIL(AVERROR_INVALIDDATA);
for (i = 0; i < cat->nb_files; i++) {
if (cat->files[i].start_time == AV_NOPTS_VALUE)
cat->files[i].start_time = time;
else
time = cat->files[i].start_time;
if (cat->files[i].duration == AV_NOPTS_VALUE)
break;
time += cat->files[i].duration;
}
if (i == cat->nb_files) {
avf->duration = time;
cat->seekable = 1;
}
cat->stream_match_mode = avf->nb_streams ? MATCH_EXACT_ID :
MATCH_ONE_TO_ONE;
if ((ret = open_file(avf, 0)) < 0)
goto fail;
return 0;
fail:
concat_read_close(avf);
return ret;
}
static int open_next_file(AVFormatContext *avf)
{
ConcatContext *cat = avf->priv_data;
unsigned fileno = cat->cur_file - cat->files;
if (cat->cur_file->duration == AV_NOPTS_VALUE)
cat->cur_file->duration = cat->avf->duration;
if (++fileno >= cat->nb_files)
return AVERROR_EOF;
return open_file(avf, fileno);
}
static int filter_packet(AVFormatContext *avf, ConcatStream *cs, AVPacket *pkt)
{
AVStream *st = avf->streams[cs->out_stream_index];
AVBitStreamFilterContext *bsf;
AVPacket pkt2;
int ret;
av_assert0(cs->out_stream_index >= 0);
for (bsf = cs->bsf; bsf; bsf = bsf->next) {
pkt2 = *pkt;
ret = av_bitstream_filter_filter(bsf, st->codec, NULL,
&pkt2.data, &pkt2.size,
pkt->data, pkt->size,
!!(pkt->flags & AV_PKT_FLAG_KEY));
if (ret < 0) {
av_packet_unref(pkt);
return ret;
}
av_assert0(pkt2.buf);
if (ret == 0 && pkt2.data != pkt->data) {
if ((ret = av_copy_packet(&pkt2, pkt)) < 0) {
av_free(pkt2.data);
return ret;
}
ret = 1;
}
if (ret > 0) {
av_free_packet(pkt);
pkt2.buf = av_buffer_create(pkt2.data, pkt2.size,
av_buffer_default_free, NULL, 0);
if (!pkt2.buf) {
av_free(pkt2.data);
return AVERROR(ENOMEM);
}
}
*pkt = pkt2;
}
return 0;
}
static int concat_read_packet(AVFormatContext *avf, AVPacket *pkt)
{
ConcatContext *cat = avf->priv_data;
int ret;
int64_t delta;
ConcatStream *cs;
while (1) {
ret = av_read_frame(cat->avf, pkt);
if (ret == AVERROR_EOF) {
if ((ret = open_next_file(avf)) < 0)
return ret;
continue;
}
if (ret < 0)
return ret;
if ((ret = match_streams(avf)) < 0) {
av_packet_unref(pkt);
return ret;
}
cs = &cat->cur_file->streams[pkt->stream_index];
if (cs->out_stream_index < 0) {
av_packet_unref(pkt);
continue;
}
pkt->stream_index = cs->out_stream_index;
break;
}
if ((ret = filter_packet(avf, cs, pkt)))
return ret;
delta = av_rescale_q(cat->cur_file->start_time - cat->avf->start_time,
AV_TIME_BASE_Q,
cat->avf->streams[pkt->stream_index]->time_base);
if (pkt->pts != AV_NOPTS_VALUE)
pkt->pts += delta;
if (pkt->dts != AV_NOPTS_VALUE)
pkt->dts += delta;
return ret;
}
static void rescale_interval(AVRational tb_in, AVRational tb_out,
int64_t *min_ts, int64_t *ts, int64_t *max_ts)
{
*ts = av_rescale_q (* ts, tb_in, tb_out);
*min_ts = av_rescale_q_rnd(*min_ts, tb_in, tb_out,
AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
*max_ts = av_rescale_q_rnd(*max_ts, tb_in, tb_out,
AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
}
static int try_seek(AVFormatContext *avf, int stream,
int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
{
ConcatContext *cat = avf->priv_data;
int64_t t0 = cat->cur_file->start_time - cat->avf->start_time;
ts -= t0;
min_ts = min_ts == INT64_MIN ? INT64_MIN : min_ts - t0;
max_ts = max_ts == INT64_MAX ? INT64_MAX : max_ts - t0;
if (stream >= 0) {
if (stream >= cat->avf->nb_streams)
return AVERROR(EIO);
rescale_interval(AV_TIME_BASE_Q, cat->avf->streams[stream]->time_base,
&min_ts, &ts, &max_ts);
}
return avformat_seek_file(cat->avf, stream, min_ts, ts, max_ts, flags);
}
static int real_seek(AVFormatContext *avf, int stream,
int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
{
ConcatContext *cat = avf->priv_data;
int ret, left, right;
if (stream >= 0) {
if (stream >= avf->nb_streams)
return AVERROR(EINVAL);
rescale_interval(avf->streams[stream]->time_base, AV_TIME_BASE_Q,
&min_ts, &ts, &max_ts);
}
left = 0;
right = cat->nb_files;
while (right - left > 1) {
int mid = (left + right) / 2;
if (ts < cat->files[mid].start_time)
right = mid;
else
left = mid;
}
if ((ret = open_file(avf, left)) < 0)
return ret;
ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
if (ret < 0 &&
left < cat->nb_files - 1 &&
cat->files[left + 1].start_time < max_ts) {
if ((ret = open_file(avf, left + 1)) < 0)
return ret;
ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
}
return ret;
}
static int concat_seek(AVFormatContext *avf, int stream,
int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
{
ConcatContext *cat = avf->priv_data;
ConcatFile *cur_file_saved = cat->cur_file;
AVFormatContext *cur_avf_saved = cat->avf;
int ret;
if (!cat->seekable)
return AVERROR(ESPIPE); /* XXX: can we use it? */
if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME))
return AVERROR(ENOSYS);
cat->avf = NULL;
if ((ret = real_seek(avf, stream, min_ts, ts, max_ts, flags)) < 0) {
if (cat->avf)
avformat_close_input(&cat->avf);
cat->avf = cur_avf_saved;
cat->cur_file = cur_file_saved;
} else {
avformat_close_input(&cur_avf_saved);
}
return ret;
}
#define OFFSET(x) offsetof(ConcatContext, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
{ "safe", "enable safe mode",
OFFSET(safe), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, DEC },
{ "auto_convert", "automatically convert bitstream format",
OFFSET(auto_convert), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC },
{ NULL }
};
static const AVClass concat_class = {
.class_name = "concat demuxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVInputFormat ff_concat_demuxer = {
.name = "concat",
.long_name = NULL_IF_CONFIG_SMALL("Virtual concatenation script"),
.priv_data_size = sizeof(ConcatContext),
.read_probe = concat_probe,
.read_header = concat_read_header,
.read_packet = concat_read_packet,
.read_close = concat_read_close,
.read_seek2 = concat_seek,
.priv_class = &concat_class,
};
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