412 lines
12 KiB
C
412 lines
12 KiB
C
/*
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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 "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "avformat.h"
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#include "internal.h"
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#include "url.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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AVClass *class;
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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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int safe;
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int seekable;
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} ConcatContext;
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static int concat_probe(AVProbeData *probe)
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{
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return memcmp(probe->buf, "ffconcat version 1.0", 20) ?
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0 : AVPROBE_SCORE_MAX;
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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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static int safe_filename(const char *f)
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{
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const char *start = f;
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for (; *f; f++) {
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/* A-Za-z0-9_- */
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if (!((unsigned)((*f | 32) - 'a') < 26 ||
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(unsigned)(*f - '0') < 10 || *f == '_' || *f == '-')) {
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if (f == start)
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return 0;
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else if (*f == '/')
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start = f + 1;
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else if (*f != '.')
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return 0;
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}
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}
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return 1;
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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 = NULL;
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size_t url_len;
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int ret;
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if (cat->safe > 0 && !safe_filename(filename)) {
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av_log(avf, AV_LOG_ERROR, "Unsafe file name '%s'\n", filename);
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FAIL(AVERROR(EPERM));
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}
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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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FAIL(AVERROR(ENOMEM));
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ff_make_absolute_url(url, url_len, avf->filename, filename);
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av_freep(&filename);
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if (cat->nb_files >= *nb_files_alloc) {
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size_t n = FFMAX(*nb_files_alloc * 2, 16);
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ConcatFile *new_files;
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if (n <= cat->nb_files || n > SIZE_MAX / sizeof(*cat->files) ||
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!(new_files = av_realloc(cat->files, n * sizeof(*cat->files))))
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FAIL(AVERROR(ENOMEM));
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cat->files = new_files;
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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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fail:
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av_free(url);
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av_free(filename);
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return ret;
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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 (cat->avf)
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avformat_close_input(&cat->avf);
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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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int64_t time = 0;
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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 if (!strcmp(keyword, "duration")) {
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char *dur_str = get_keyword(&cursor);
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int64_t dur;
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if (!file) {
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av_log(avf, AV_LOG_ERROR, "Line %d: duration without file\n",
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line);
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FAIL(AVERROR_INVALIDDATA);
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}
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if ((ret = av_parse_time(&dur, dur_str, 1)) < 0) {
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av_log(avf, AV_LOG_ERROR, "Line %d: invalid duration '%s'\n",
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line, dur_str);
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FAIL(ret);
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}
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file->duration = dur;
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} else if (!strcmp(keyword, "ffconcat")) {
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char *ver_kw = get_keyword(&cursor);
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char *ver_val = get_keyword(&cursor);
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if (strcmp(ver_kw, "version") || strcmp(ver_val, "1.0")) {
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av_log(avf, AV_LOG_ERROR, "Line %d: invalid version\n", line);
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FAIL(AVERROR_INVALIDDATA);
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}
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if (cat->safe < 0)
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cat->safe = 1;
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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 (!cat->nb_files)
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FAIL(AVERROR_INVALIDDATA);
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for (i = 0; i < cat->nb_files; i++) {
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if (cat->files[i].start_time == AV_NOPTS_VALUE)
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cat->files[i].start_time = time;
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else
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time = cat->files[i].start_time;
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if (cat->files[i].duration == AV_NOPTS_VALUE)
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break;
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time += cat->files[i].duration;
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}
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if (i == cat->nb_files) {
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avf->duration = time;
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cat->seekable = 1;
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}
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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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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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if (ret < 0)
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return ret;
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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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static void rescale_interval(AVRational tb_in, AVRational tb_out,
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int64_t *min_ts, int64_t *ts, int64_t *max_ts)
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{
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*ts = av_rescale_q (* ts, tb_in, tb_out);
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*min_ts = av_rescale_q_rnd(*min_ts, tb_in, tb_out,
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AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
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*max_ts = av_rescale_q_rnd(*max_ts, tb_in, tb_out,
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AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
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}
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static int try_seek(AVFormatContext *avf, int stream,
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int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
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{
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ConcatContext *cat = avf->priv_data;
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int64_t t0 = cat->cur_file->start_time - cat->avf->start_time;
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ts -= t0;
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min_ts = min_ts == INT64_MIN ? INT64_MIN : min_ts - t0;
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max_ts = max_ts == INT64_MAX ? INT64_MAX : max_ts - t0;
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if (stream >= 0) {
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if (stream >= cat->avf->nb_streams)
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return AVERROR(EIO);
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rescale_interval(AV_TIME_BASE_Q, cat->avf->streams[stream]->time_base,
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&min_ts, &ts, &max_ts);
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}
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return avformat_seek_file(cat->avf, stream, min_ts, ts, max_ts, flags);
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}
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static int real_seek(AVFormatContext *avf, int stream,
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int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
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{
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ConcatContext *cat = avf->priv_data;
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int ret, left, right;
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if (stream >= 0) {
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if (stream >= avf->nb_streams)
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return AVERROR(EINVAL);
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rescale_interval(avf->streams[stream]->time_base, AV_TIME_BASE_Q,
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&min_ts, &ts, &max_ts);
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}
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left = 0;
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right = cat->nb_files;
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while (right - left > 1) {
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int mid = (left + right) / 2;
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if (ts < cat->files[mid].start_time)
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right = mid;
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else
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left = mid;
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}
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if ((ret = open_file(avf, left)) < 0)
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return ret;
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ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
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if (ret < 0 &&
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left < cat->nb_files - 1 &&
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cat->files[left + 1].start_time < max_ts) {
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if ((ret = open_file(avf, left + 1)) < 0)
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return ret;
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ret = try_seek(avf, stream, min_ts, ts, max_ts, flags);
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}
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return ret;
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}
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static int concat_seek(AVFormatContext *avf, int stream,
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int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
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{
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ConcatContext *cat = avf->priv_data;
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ConcatFile *cur_file_saved = cat->cur_file;
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AVFormatContext *cur_avf_saved = cat->avf;
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int ret;
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if (!cat->seekable)
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return AVERROR(ESPIPE); /* XXX: can we use it? */
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if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME))
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return AVERROR(ENOSYS);
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cat->avf = NULL;
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if ((ret = real_seek(avf, stream, min_ts, ts, max_ts, flags)) < 0) {
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if (cat->avf)
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avformat_close_input(&cat->avf);
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cat->avf = cur_avf_saved;
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cat->cur_file = cur_file_saved;
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} else {
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avformat_close_input(&cur_avf_saved);
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}
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return ret;
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}
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#define OFFSET(x) offsetof(ConcatContext, x)
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#define DEC AV_OPT_FLAG_DECODING_PARAM
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static const AVOption options[] = {
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{ "safe", "enable safe mode",
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OFFSET(safe), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, DEC },
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{ NULL }
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};
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static const AVClass concat_class = {
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.class_name = "concat demuxer",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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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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.read_seek2 = concat_seek,
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.priv_class = &concat_class,
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};
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