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Diffstat (limited to 'ffmpeg/libavformat/concatdec.c')
-rw-r--r--ffmpeg/libavformat/concatdec.c411
1 files changed, 0 insertions, 411 deletions
diff --git a/ffmpeg/libavformat/concatdec.c b/ffmpeg/libavformat/concatdec.c
deleted file mode 100644
index 86f82e0..0000000
--- a/ffmpeg/libavformat/concatdec.c
+++ /dev/null
@@ -1,411 +0,0 @@
-/*
- * 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/avstring.h"
-#include "libavutil/opt.h"
-#include "libavutil/parseutils.h"
-#include "avformat.h"
-#include "internal.h"
-#include "url.h"
-
-typedef struct {
- char *url;
- int64_t start_time;
- int64_t duration;
-} ConcatFile;
-
-typedef struct {
- AVClass *class;
- ConcatFile *files;
- ConcatFile *cur_file;
- unsigned nb_files;
- AVFormatContext *avf;
- int safe;
- int seekable;
-} 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;
- size_t url_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));
- }
- 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 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);
- 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);
- 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;
- 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);
- 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;
- AVStream *st, *source_st;
- 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)
- FAIL(ret);
- } 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);
- FAIL(ret);
- }
- file->duration = dur;
- } 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)
- FAIL(ret);
- 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;
- }
-
- if ((ret = open_file(avf, 0)) < 0)
- FAIL(ret);
- for (i = 0; i < cat->avf->nb_streams; i++) {
- if (!(st = avformat_new_stream(avf, NULL)))
- FAIL(AVERROR(ENOMEM));
- source_st = cat->avf->streams[i];
- if ((ret = avcodec_copy_context(st->codec, source_st->codec)) < 0)
- FAIL(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;
-
-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 concat_read_packet(AVFormatContext *avf, AVPacket *pkt)
-{
- ConcatContext *cat = avf->priv_data;
- int ret;
- int64_t delta;
-
- while (1) {
- if ((ret = av_read_frame(cat->avf, pkt)) != AVERROR_EOF ||
- (ret = open_next_file(avf)) < 0)
- break;
- }
- if (ret < 0)
- 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 },
- { 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,
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 14:25:20 +0000