mirror of
https://git.ffmpeg.org/ffmpeg.git
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358 lines
8.3 KiB
C
358 lines
8.3 KiB
C
/*
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* Image format
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
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* Copyright (c) 2004 Michael Niedermayer
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* 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
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avformat.h"
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typedef struct {
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int img_first;
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int img_last;
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int img_number;
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int img_count;
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int is_pipe;
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char path[1024];
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} VideoData;
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typedef struct {
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enum CodecID id;
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const char *str;
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} IdStrMap;
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static const IdStrMap img_tags[] = {
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{ CODEC_ID_MJPEG , "jpeg"},
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{ CODEC_ID_MJPEG , "jpg"},
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{ CODEC_ID_LJPEG , "ljpg"},
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{ CODEC_ID_MPEG1VIDEO, "mpg1-img"},
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{ CODEC_ID_MPEG2VIDEO, "mpg2-img"},
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{ CODEC_ID_MPEG4 , "mpg4-img"},
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{ CODEC_ID_FFV1 , "ffv1-img"},
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{0, NULL}
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};
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static enum CodecID av_str2id(const IdStrMap *tags, const char *str)
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{
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while(*str && *str!='.') str++;
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if(*str) str++;
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while (tags->id) {
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int i;
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for(i=0; toupper(tags->str[i]) == toupper(str[i]); i++){
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if(tags->str[i]==0 && str[i]==0)
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return tags->id;
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}
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tags++;
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}
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return CODEC_ID_NONE;
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}
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static const char *av_id2str(const IdStrMap *tags, enum CodecID id)
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{
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while (tags->id) {
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if(tags->id == id)
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return tags->str;
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tags++;
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}
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return NULL;
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}
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/* return -1 if no image found */
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static int find_image_range(int *pfirst_index, int *plast_index,
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const char *path)
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{
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char buf[1024];
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int range, last_index, range1, first_index;
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/* find the first image */
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for(first_index = 0; first_index < 5; first_index++) {
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if (get_frame_filename(buf, sizeof(buf), path, first_index) < 0){
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*pfirst_index =
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*plast_index = 1;
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return 0;
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}
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if (url_exist(buf))
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break;
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}
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if (first_index == 5)
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goto fail;
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/* find the last image */
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last_index = first_index;
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for(;;) {
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range = 0;
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for(;;) {
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if (!range)
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range1 = 1;
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else
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range1 = 2 * range;
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if (get_frame_filename(buf, sizeof(buf), path,
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last_index + range1) < 0)
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goto fail;
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if (!url_exist(buf))
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break;
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range = range1;
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/* just in case... */
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if (range >= (1 << 30))
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goto fail;
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}
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/* we are sure than image last_index + range exists */
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if (!range)
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break;
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last_index += range;
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}
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*pfirst_index = first_index;
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*plast_index = last_index;
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return 0;
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fail:
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return -1;
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}
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static int image_probe(AVProbeData *p)
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{
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if (filename_number_test(p->filename) >= 0 && av_str2id(img_tags, p->filename))
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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}
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static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
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{
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VideoData *s = s1->priv_data;
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int first_index, last_index;
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AVStream *st;
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s1->ctx_flags |= AVFMTCTX_NOHEADER;
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st = av_new_stream(s1, 0);
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if (!st) {
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av_free(s);
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return -ENOMEM;
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}
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strcpy(s->path, s1->filename);
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s->img_number = 0;
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s->img_count = 0;
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/* find format */
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if (s1->iformat->flags & AVFMT_NOFILE)
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s->is_pipe = 0;
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else
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s->is_pipe = 1;
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if (!ap || !ap->frame_rate) {
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st->codec.frame_rate = 25;
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st->codec.frame_rate_base = 1;
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} else {
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st->codec.frame_rate = ap->frame_rate;
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st->codec.frame_rate_base = ap->frame_rate_base;
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}
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if (!s->is_pipe) {
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if (find_image_range(&first_index, &last_index, s->path) < 0)
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goto fail;
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s->img_first = first_index;
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s->img_last = last_index;
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s->img_number = first_index;
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/* compute duration */
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st->start_time = 0;
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st->duration = ((int64_t)AV_TIME_BASE *
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(last_index - first_index + 1) *
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st->codec.frame_rate_base) / st->codec.frame_rate;
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}
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st->codec.codec_type = CODEC_TYPE_VIDEO;
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st->codec.codec_id = av_str2id(img_tags, s->path);
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return 0;
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fail:
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av_free(s);
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return AVERROR_IO;
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}
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static int img_read_packet(AVFormatContext *s1, AVPacket *pkt)
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{
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VideoData *s = s1->priv_data;
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char filename[1024];
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int ret;
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ByteIOContext f1, *f;
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if (!s->is_pipe) {
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/* loop over input */
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/* if (loop_input && s->img_number > s->img_last) {
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s->img_number = s->img_first;
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}*/
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if (get_frame_filename(filename, sizeof(filename),
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s->path, s->img_number)<0 && s->img_number > 1)
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return AVERROR_IO;
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f = &f1;
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if (url_fopen(f, filename, URL_RDONLY) < 0)
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return AVERROR_IO;
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} else {
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f = &s1->pb;
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if (url_feof(f))
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return AVERROR_IO;
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}
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if (s->is_pipe) {
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av_new_packet(pkt, 4096);
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}else{
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av_new_packet(pkt, url_filesize(url_fileno(f)));
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}
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pkt->stream_index = 0;
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pkt->flags |= PKT_FLAG_KEY;
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ret = get_buffer(f, pkt->data, pkt->size);
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if (!s->is_pipe) {
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url_fclose(f);
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}
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if (ret <= 0) {
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av_free_packet(pkt);
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return AVERROR_IO; /* signal EOF */
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} else {
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s->img_count++;
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s->img_number++;
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return 0;
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}
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}
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static int img_read_close(AVFormatContext *s1)
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{
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return 0;
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}
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/******************************************************/
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/* image output */
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static int img_write_header(AVFormatContext *s)
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{
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VideoData *img = s->priv_data;
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img->img_number = 1;
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strcpy(img->path, s->filename);
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/* find format */
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if (s->oformat->flags & AVFMT_NOFILE)
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img->is_pipe = 0;
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else
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img->is_pipe = 1;
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return 0;
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}
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static int img_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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VideoData *img = s->priv_data;
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ByteIOContext pb1, *pb;
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char filename[1024];
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if (!img->is_pipe) {
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if (get_frame_filename(filename, sizeof(filename),
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img->path, img->img_number) < 0 && img->img_number>1)
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return AVERROR_IO;
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pb = &pb1;
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if (url_fopen(pb, filename, URL_WRONLY) < 0)
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return AVERROR_IO;
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} else {
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pb = &s->pb;
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}
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put_buffer(pb, pkt->data, pkt->size);
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put_flush_packet(pb);
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if (!img->is_pipe) {
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url_fclose(pb);
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}
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img->img_number++;
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return 0;
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}
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static int img_write_trailer(AVFormatContext *s)
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{
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return 0;
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}
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/* input */
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static AVInputFormat image2_iformat = {
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"image2",
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"image2 sequence",
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sizeof(VideoData),
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image_probe,
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img_read_header,
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img_read_packet,
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img_read_close,
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NULL,
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NULL,
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AVFMT_NOFILE,
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};
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static AVInputFormat image2pipe_iformat = {
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"image2pipe",
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"piped image2 sequence",
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sizeof(VideoData),
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NULL, /* no probe */
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img_read_header,
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img_read_packet,
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img_read_close,
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NULL,
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};
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/* output */
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static AVOutputFormat image2_oformat = {
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"image2",
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"image2 sequence",
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"",
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"",
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sizeof(VideoData),
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CODEC_ID_NONE,
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CODEC_ID_MJPEG,
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img_write_header,
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img_write_packet,
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img_write_trailer,
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AVFMT_NOFILE,
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};
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static AVOutputFormat image2pipe_oformat = {
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"image2pipe",
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"piped image2 sequence",
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"",
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"",
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sizeof(VideoData),
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CODEC_ID_NONE,
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CODEC_ID_MJPEG,
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img_write_header,
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img_write_packet,
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img_write_trailer,
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};
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int img2_init(void)
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{
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av_register_input_format(&image2_iformat);
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av_register_output_format(&image2_oformat);
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av_register_input_format(&image2pipe_iformat);
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av_register_output_format(&image2pipe_oformat);
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return 0;
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}
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