mirror of https://github.com/FFmpeg/FFmpeg.git
Nicolas George
13 years ago
parent
c3fa6add58
commit
32aedebdc5
6 changed files with 256 additions and 1 deletions
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/*
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* Copyright (c) 2012 Nicolas George |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public License |
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* as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with FFmpeg; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/avstring.h" |
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#include "avformat.h" |
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#include "internal.h" |
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typedef struct { |
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char *url; |
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int64_t start_time; |
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int64_t duration; |
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} ConcatFile; |
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typedef struct { |
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ConcatFile *files; |
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ConcatFile *cur_file; |
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unsigned nb_files; |
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AVFormatContext *avf; |
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} ConcatContext; |
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static int concat_probe(AVProbeData *probe) |
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{ |
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return 0; |
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} |
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static char *get_keyword(uint8_t **cursor) |
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{ |
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char *ret = *cursor += strspn(*cursor, SPACE_CHARS); |
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*cursor += strcspn(*cursor, SPACE_CHARS); |
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if (**cursor) { |
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*((*cursor)++) = 0; |
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*cursor += strspn(*cursor, SPACE_CHARS); |
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} |
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return ret; |
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} |
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#define FAIL(retcode) do { ret = (retcode); goto fail; } while(0) |
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static int add_file(AVFormatContext *avf, char *filename, ConcatFile **rfile, |
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unsigned *nb_files_alloc) |
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{ |
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ConcatContext *cat = avf->priv_data; |
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ConcatFile *file; |
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char *url; |
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size_t url_len; |
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url_len = strlen(avf->filename) + strlen(filename) + 16; |
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if (!(url = av_malloc(url_len))) |
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return AVERROR(ENOMEM); |
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ff_make_absolute_url(url, url_len, avf->filename, filename); |
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av_free(filename); |
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if (cat->nb_files >= *nb_files_alloc) { |
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unsigned n = FFMAX(*nb_files_alloc * 2, 16); |
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if (n <= cat->nb_files || |
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!(cat->files = av_realloc_f(cat->files, n, sizeof(*cat->files)))) |
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return AVERROR(ENOMEM); |
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*nb_files_alloc = n; |
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} |
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file = &cat->files[cat->nb_files++]; |
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memset(file, 0, sizeof(*file)); |
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*rfile = file; |
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file->url = url; |
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file->start_time = AV_NOPTS_VALUE; |
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file->duration = AV_NOPTS_VALUE; |
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return 0; |
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} |
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static int open_file(AVFormatContext *avf, unsigned fileno) |
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{ |
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ConcatContext *cat = avf->priv_data; |
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ConcatFile *file = &cat->files[fileno]; |
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int ret; |
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if ((ret = avformat_open_input(&cat->avf, file->url, NULL, NULL)) < 0 || |
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(ret = avformat_find_stream_info(cat->avf, NULL)) < 0) { |
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av_log(avf, AV_LOG_ERROR, "Impossible to open '%s'\n", file->url); |
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return ret; |
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} |
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cat->cur_file = file; |
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if (file->start_time == AV_NOPTS_VALUE) |
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file->start_time = !fileno ? 0 : |
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cat->files[fileno - 1].start_time + |
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cat->files[fileno - 1].duration; |
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return 0; |
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} |
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static int concat_read_close(AVFormatContext *avf) |
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{ |
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ConcatContext *cat = avf->priv_data; |
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unsigned i; |
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if (cat->avf) |
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avformat_close_input(&cat->avf); |
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for (i = 0; i < cat->nb_files; i++) |
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av_freep(&cat->files[i].url); |
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av_freep(&cat->files); |
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return 0; |
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} |
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static int concat_read_header(AVFormatContext *avf) |
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{ |
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ConcatContext *cat = avf->priv_data; |
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uint8_t buf[4096]; |
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uint8_t *cursor, *keyword; |
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int ret, line = 0, i; |
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unsigned nb_files_alloc = 0; |
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ConcatFile *file = NULL; |
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AVStream *st, *source_st; |
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while (1) { |
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if ((ret = ff_get_line(avf->pb, buf, sizeof(buf))) <= 0) |
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break; |
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line++; |
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cursor = buf; |
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keyword = get_keyword(&cursor); |
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if (!*keyword || *keyword == '#') |
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continue; |
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if (!strcmp(keyword, "file")) { |
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char *filename = av_get_token((const char **)&cursor, SPACE_CHARS); |
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if (!filename) { |
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av_log(avf, AV_LOG_ERROR, "Line %d: filename required\n", line); |
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FAIL(AVERROR_INVALIDDATA); |
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} |
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if ((ret = add_file(avf, filename, &file, &nb_files_alloc)) < 0) |
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FAIL(ret); |
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} else { |
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av_log(avf, AV_LOG_ERROR, "Line %d: unknown keyword '%s'\n", |
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line, keyword); |
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FAIL(AVERROR_INVALIDDATA); |
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} |
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} |
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if (ret < 0) |
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FAIL(ret); |
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if ((ret = open_file(avf, 0)) < 0) |
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FAIL(ret); |
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for (i = 0; i < cat->avf->nb_streams; i++) { |
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if (!(st = avformat_new_stream(avf, NULL))) |
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FAIL(AVERROR(ENOMEM)); |
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source_st = cat->avf->streams[i]; |
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if ((ret = avcodec_copy_context(st->codec, source_st->codec)) < 0) |
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FAIL(ret); |
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st->r_frame_rate = source_st->r_frame_rate; |
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st->avg_frame_rate = source_st->avg_frame_rate; |
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st->time_base = source_st->time_base; |
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st->sample_aspect_ratio = source_st->sample_aspect_ratio; |
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} |
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return 0; |
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fail: |
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concat_read_close(avf); |
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return ret; |
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} |
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static int open_next_file(AVFormatContext *avf) |
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{ |
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ConcatContext *cat = avf->priv_data; |
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unsigned fileno = cat->cur_file - cat->files; |
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if (cat->cur_file->duration == AV_NOPTS_VALUE) |
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cat->cur_file->duration = cat->avf->duration; |
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if (++fileno >= cat->nb_files) |
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return AVERROR_EOF; |
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avformat_close_input(&cat->avf); |
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return open_file(avf, fileno); |
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} |
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static int concat_read_packet(AVFormatContext *avf, AVPacket *pkt) |
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{ |
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ConcatContext *cat = avf->priv_data; |
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int ret; |
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int64_t delta; |
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while (1) { |
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if ((ret = av_read_frame(cat->avf, pkt)) != AVERROR_EOF || |
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(ret = open_next_file(avf)) < 0) |
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break; |
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} |
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delta = av_rescale_q(cat->cur_file->start_time - cat->avf->start_time, |
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AV_TIME_BASE_Q, |
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cat->avf->streams[pkt->stream_index]->time_base); |
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if (pkt->pts != AV_NOPTS_VALUE) |
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pkt->pts += delta; |
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if (pkt->dts != AV_NOPTS_VALUE) |
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pkt->dts += delta; |
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return ret; |
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} |
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AVInputFormat ff_concat_demuxer = { |
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.name = "concat", |
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.long_name = NULL_IF_CONFIG_SMALL("Virtual concatenation script"), |
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.priv_data_size = sizeof(ConcatContext), |
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.read_probe = concat_probe, |
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.read_header = concat_read_header, |
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.read_packet = concat_read_packet, |
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.read_close = concat_read_close, |
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}; |
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