avformat: split out common SMJPEG code

This is a preparation for adding SMJPEG muxer.

Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>

1 files changed, 6 insertions, 153 deletions

diff --git a/libavformat/smjpeg.c b/libavformat/smjpeg.c
index dc94361aa1..573a8a3536 100644
--- a/libavformat/smjpeg.c
+++ b/libavformat/smjpeg.c
@@ -1,6 +1,6 @@
 /*
- * SMJPEG demuxer
- * Copyright (c) 2011 Paul B Mahol
+ * SMJPEG common code
+ * Copyright (c) 2011-2012 Paul B Mahol
  *
  * This file is part of Libav.
  *
@@ -21,167 +21,20 @@
 
 /**
  * @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[] = {
+const AVCodecTag ff_codec_smjpeg_video_tags[] = {
     { CODEC_ID_MJPEG,             MKTAG('J', 'F', 'I', 'F') },
     { CODEC_ID_NONE, 0 },
 };
 
-static const AVCodecTag codec_smjpeg_audio_tags[] = {
+const AVCodecTag ff_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",
-};