/*
- * SMJPEG demuxer
- * Copyright (c) 2011 Paul B Mahol
+ * SMJPEG common code
+ * Copyright (c) 2011-2012 Paul B Mahol
*
* This file is part of Libav.
*
/**
* @file
- * This is a demuxer for Loki SDL Motion JPEG files
+ * SMJPEG common code
*/
#include "avformat.h"
#include "internal.h"
-#include "riff.h"
+#include "smjpeg.h"
-static const AVCodecTag codec_smjpeg_video_tags[] = {
- { CODEC_ID_MJPEG, MKTAG('J', 'F', 'I', 'F') },
- { CODEC_ID_NONE, 0 },
+const AVCodecTag ff_codec_smjpeg_video_tags[] = {
+ { AV_CODEC_ID_MJPEG, MKTAG('J', 'F', 'I', 'F') },
+ { AV_CODEC_ID_NONE, 0 },
};
-static const AVCodecTag codec_smjpeg_audio_tags[] = {
- { CODEC_ID_ADPCM_IMA_SMJPEG, MKTAG('A', 'P', 'C', 'M') },
- { CODEC_ID_PCM_S16LE, MKTAG('N', 'O', 'N', 'E') },
- { CODEC_ID_NONE, 0 },
-};
-
-typedef struct SMJPEGContext {
- int audio_stream_index;
- int video_stream_index;
-} SMJPEGContext;
-
-static int smjpeg_probe(AVProbeData *p)
-{
- if (!memcmp(p->buf, "\x0\xaSMJPEG", 8))
- return AVPROBE_SCORE_MAX;
- return 0;
-}
-
-static int smjpeg_read_header(AVFormatContext *s, AVFormatParameters *ap)
-{
- SMJPEGContext *sc = s->priv_data;
- AVStream *ast = NULL, *vst = NULL;
- AVIOContext *pb = s->pb;
- uint32_t version, htype, hlength, duration;
- char *comment;
-
- avio_skip(pb, 8); // magic
- version = avio_rb32(pb);
- if (version)
- av_log_ask_for_sample(s, "unknown version %d\n", version);
-
- duration = avio_rb32(pb); // in msec
-
- while (!pb->eof_reached) {
- htype = avio_rl32(pb);
- switch (htype) {
- case MKTAG('_', 'T', 'X', 'T'):
- hlength = avio_rb32(pb);
- if (!hlength || hlength > 512)
- return AVERROR_INVALIDDATA;
- comment = av_malloc(hlength + 1);
- if (!comment)
- return AVERROR(ENOMEM);
- if (avio_read(pb, comment, hlength) != hlength) {
- av_freep(&comment);
- av_log(s, AV_LOG_ERROR, "error when reading comment\n");
- return AVERROR_INVALIDDATA;
- }
- comment[hlength] = 0;
- av_dict_set(&s->metadata, "comment", comment,
- AV_DICT_DONT_STRDUP_VAL);
- break;
- case MKTAG('_', 'S', 'N', 'D'):
- if (ast) {
- av_log_ask_for_sample(s, "multiple audio streams not supported\n");
- return AVERROR_INVALIDDATA;
- }
- hlength = avio_rb32(pb);
- if (hlength < 8)
- return AVERROR_INVALIDDATA;
- ast = avformat_new_stream(s, 0);
- if (!ast)
- return AVERROR(ENOMEM);
- ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
- ast->codec->sample_rate = avio_rb16(pb);
- ast->codec->bits_per_coded_sample = avio_r8(pb);
- ast->codec->channels = avio_r8(pb);
- ast->codec->codec_tag = avio_rl32(pb);
- ast->codec->codec_id = ff_codec_get_id(codec_smjpeg_audio_tags,
- ast->codec->codec_tag);
- ast->duration = duration;
- sc->audio_stream_index = ast->index;
- avpriv_set_pts_info(ast, 32, 1, 1000);
- avio_skip(pb, hlength - 8);
- break;
- case MKTAG('_', 'V', 'I', 'D'):
- if (vst) {
- av_log_ask_for_sample(s, "multiple video streams not supported\n");
- return AVERROR_INVALIDDATA;
- }
- hlength = avio_rb32(pb);
- if (hlength < 12)
- return AVERROR_INVALIDDATA;
- avio_skip(pb, 4); // number of frames
- vst = avformat_new_stream(s, 0);
- if (!vst)
- return AVERROR(ENOMEM);
- vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
- vst->codec->width = avio_rb16(pb);
- vst->codec->height = avio_rb16(pb);
- vst->codec->codec_tag = avio_rl32(pb);
- vst->codec->codec_id = ff_codec_get_id(codec_smjpeg_video_tags,
- vst->codec->codec_tag);
- vst->duration = duration;
- sc->video_stream_index = vst->index;
- avpriv_set_pts_info(vst, 32, 1, 1000);
- avio_skip(pb, hlength - 12);
- break;
- case MKTAG('H', 'E', 'N', 'D'):
- return 0;
- default:
- av_log(s, AV_LOG_ERROR, "unknown header %x\n", htype);
- return AVERROR_INVALIDDATA;
- }
- }
-
- return AVERROR_EOF;
-}
-
-static int smjpeg_read_packet(AVFormatContext *s, AVPacket *pkt)
-{
- SMJPEGContext *sc = s->priv_data;
- uint32_t dtype, ret, size, timestamp;
-
- if (s->pb->eof_reached)
- return AVERROR_EOF;
- dtype = avio_rl32(s->pb);
- switch (dtype) {
- case MKTAG('s', 'n', 'd', 'D'):
- timestamp = avio_rb32(s->pb);
- size = avio_rb32(s->pb);
- ret = av_get_packet(s->pb, pkt, size);
- pkt->stream_index = sc->audio_stream_index;
- pkt->pts = timestamp;
- break;
- case MKTAG('v', 'i', 'd', 'D'):
- timestamp = avio_rb32(s->pb);
- size = avio_rb32(s->pb);
- ret = av_get_packet(s->pb, pkt, size);
- pkt->stream_index = sc->video_stream_index;
- pkt->pts = timestamp;
- break;
- case MKTAG('D', 'O', 'N', 'E'):
- ret = AVERROR_EOF;
- break;
- default:
- av_log(s, AV_LOG_ERROR, "unknown chunk %x\n", dtype);
- ret = AVERROR_INVALIDDATA;
- break;
- }
- return ret;
-}
-
-AVInputFormat ff_smjpeg_demuxer = {
- .name = "smjpeg",
- .long_name = NULL_IF_CONFIG_SMALL("Loki SDL MJPEG"),
- .priv_data_size = sizeof(SMJPEGContext),
- .read_probe = smjpeg_probe,
- .read_header = smjpeg_read_header,
- .read_packet = smjpeg_read_packet,
- .extensions = "mjpg",
+const AVCodecTag ff_codec_smjpeg_audio_tags[] = {
+ { AV_CODEC_ID_ADPCM_IMA_SMJPEG, MKTAG('A', 'P', 'C', 'M') },
+ { AV_CODEC_ID_PCM_S16LE, MKTAG('N', 'O', 'N', 'E') },
+ { AV_CODEC_ID_NONE, 0 },
};
projects / ffmpeg / blobdiff