| /* |
| * 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); |
| |
| cat->avf = avformat_alloc_context(); |
| if (!cat->avf) |
| return AVERROR(ENOMEM); |
| |
| cat->avf->interrupt_callback = avf->interrupt_callback; |
| 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; |
| 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, |
| }; |
