*/
/**
- * @file mtv.c
+ * @file
* MTV demuxer.
*/
#include "libavutil/bswap.h"
+#include "libavutil/intreadwrite.h"
#include "avformat.h"
#define MTV_ASUBCHUNK_DATA_SIZE 500
typedef struct MTVDemuxContext {
- unsigned int file_size; ///< filesize, not always right
- unsigned int segments; ///< number of 512 byte segments
- unsigned int audio_identifier; ///< 'MP3' on all files I have seen
- unsigned int audio_br; ///< bitrate of audio chanel (mp3)
- unsigned int img_colorfmt; ///< frame colorfmt rgb 565/555
- unsigned int img_bpp; ///< frame bits per pixel
- unsigned int img_width; //
- unsigned int img_height; //
- unsigned int img_segment_size; ///< size of image segment
- unsigned int video_fps; //
- unsigned int full_segment_size;
+ unsigned int file_size; ///< filesize, not always right
+ unsigned int segments; ///< number of 512 byte segments
+ unsigned int audio_identifier; ///< 'MP3' on all files I have seen
+ unsigned int audio_br; ///< bitrate of audio channel (mp3)
+ unsigned int img_colorfmt; ///< frame colorfmt rgb 565/555
+ unsigned int img_bpp; ///< frame bits per pixel
+ unsigned int img_width; //
+ unsigned int img_height; //
+ unsigned int img_segment_size; ///< size of image segment
+ unsigned int video_fps; //
+ unsigned int full_segment_size;
} MTVDemuxContext;
static int mtv_probe(AVProbeData *p)
{
/* Magic is 'AMV' */
-
if(*(p->buf) != 'A' || *(p->buf+1) != 'M' || *(p->buf+2) != 'V')
return 0;
+ /* Check for nonzero in bpp and (width|height) header fields */
+ if(!(p->buf[51] && AV_RL16(&p->buf[52]) | AV_RL16(&p->buf[54])))
+ return 0;
+
+ /* If width or height are 0 then imagesize header field should not */
+ if(!AV_RL16(&p->buf[52]) || !AV_RL16(&p->buf[54]))
+ {
+ if(!!AV_RL16(&p->buf[56]))
+ return AVPROBE_SCORE_MAX/2;
+ else
+ return 0;
+ }
+
+ if(p->buf[51] != 16)
+ return AVPROBE_SCORE_MAX/4; // But we are going to assume 16bpp anyway ..
+
return AVPROBE_SCORE_MAX;
}
static int mtv_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
- MTVDemuxContext *mtv = s->priv_data;
- ByteIOContext *pb = s->pb;
- AVStream *st;
- unsigned int audio_subsegments;
-
+ MTVDemuxContext *mtv = s->priv_data;
+ ByteIOContext *pb = s->pb;
+ AVStream *st;
+ unsigned int audio_subsegments;
url_fskip(pb, 3);
mtv->file_size = get_le32(pb);
mtv->img_width = get_le16(pb);
mtv->img_height = get_le16(pb);
mtv->img_segment_size = get_le16(pb);
+
+ /* Calculate width and height if missing from header */
+
+ if(!mtv->img_width)
+ mtv->img_width=mtv->img_segment_size / (mtv->img_bpp>>3)
+ / mtv->img_height;
+
+ if(!mtv->img_height)
+ mtv->img_height=mtv->img_segment_size / (mtv->img_bpp>>3)
+ / mtv->img_width;
+
url_fskip(pb, 4);
audio_subsegments = get_le16(pb);
mtv->full_segment_size =
return AVERROR(ENOMEM);
av_set_pts_info(st, 64, 1, mtv->video_fps);
- st->codec->codec_type = CODEC_TYPE_VIDEO;
+ st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = CODEC_ID_RAWVIDEO;
- st->codec->codec_tag = MKTAG('R', 'G', 'B', mtv->img_bpp);
+ st->codec->pix_fmt = PIX_FMT_RGB565;
st->codec->width = mtv->img_width;
st->codec->height = mtv->img_height;
- st->codec->bits_per_coded_sample = mtv->img_bpp;
st->codec->sample_rate = mtv->video_fps;
+ st->codec->extradata = av_strdup("BottomUp");
+ st->codec->extradata_size = 9;
// audio - mp3
return AVERROR(ENOMEM);
av_set_pts_info(st, 64, 1, AUDIO_SAMPLING_RATE);
- st->codec->codec_type = CODEC_TYPE_AUDIO;
+ st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_MP3;
st->codec->bit_rate = mtv->audio_br;
st->need_parsing = AVSTREAM_PARSE_FULL;
MTVDemuxContext *mtv = s->priv_data;
ByteIOContext *pb = s->pb;
int ret;
-#ifndef WORDS_BIGENDIAN
+#if !HAVE_BIGENDIAN
int i;
#endif
- ret = 0;
-
if((url_ftell(pb) - s->data_offset + mtv->img_segment_size) % mtv->full_segment_size)
{
url_fskip(pb, MTV_AUDIO_PADDING_SIZE);
ret = av_get_packet(pb, pkt, MTV_ASUBCHUNK_DATA_SIZE);
- if(ret != MTV_ASUBCHUNK_DATA_SIZE)
- return AVERROR(EIO);
+ if(ret < 0)
+ return ret;
pkt->pos -= MTV_AUDIO_PADDING_SIZE;
pkt->stream_index = AUDIO_SID;
}else
{
ret = av_get_packet(pb, pkt, mtv->img_segment_size);
- if(ret != mtv->img_segment_size)
- return AVERROR(EIO);
+ if(ret < 0)
+ return ret;
-#ifndef WORDS_BIGENDIAN
+#if !HAVE_BIGENDIAN
/* pkt->data is GGGRRRR BBBBBGGG
* and we need RRRRRGGG GGGBBBBB
*/
for(i=0;i<mtv->img_segment_size/2;i++)
- *((uint16_t *)pkt->data+i) = bswap_16(*((uint16_t *)pkt->data+i));
+ *((uint16_t *)pkt->data+i) = av_bswap16(*((uint16_t *)pkt->data+i));
#endif
pkt->stream_index = VIDEO_SID;
}