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Better VQA demuxer

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Originally committed as revision 7184 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2006-11-29 05:42:59 +00:00
parent 7667896a36
commit 61710f7bb5
1 changed files with 63 additions and 32 deletions
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95
libavformat/westwood.c
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@ -44,6 +44,7 @@
#define VQHD_TAG MKBETAG('V', 'Q', 'H', 'D')
#define FINF_TAG MKBETAG('F', 'I', 'N', 'F')
#define SND0_TAG MKBETAG('S', 'N', 'D', '0')
#define SND1_TAG MKBETAG('S', 'N', 'D', '1')
#define SND2_TAG MKBETAG('S', 'N', 'D', '2')
#define VQFR_TAG MKBETAG('V', 'Q', 'F', 'R')
@ -54,6 +55,7 @@
#define PINF_TAG MKBETAG('P', 'I', 'N', 'F')
#define PINH_TAG MKBETAG('P', 'I', 'N', 'H')
#define PIND_TAG MKBETAG('P', 'I', 'N', 'D')
#define CMDS_TAG MKBETAG('C', 'M', 'D', 'S')
#define VQA_HEADER_SIZE 0x2A
#define VQA_FRAMERATE 15
@ -243,17 +245,27 @@ static int wsvqa_read_header(AVFormatContext *s,
st->codec->width = LE_16(&header[6]);
st->codec->height = LE_16(&header[8]);
/* initialize the audio decoder stream is sample rate is non-zero */
if (LE_16(&header[24])) {
st->codec->time_base.num = 1;
st->codec->time_base.den = VQA_FRAMERATE;
/* initialize the audio decoder stream for VQA v1 or nonzero samplerate */
if (LE_16(&header[24]) || (LE_16(&header[0]) == 1)) {
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
av_set_pts_info(st, 33, 1, 90000);
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_ADPCM_IMA_WS;
if (LE_16(&header[0]) == 1)
st->codec->codec_id = CODEC_ID_WESTWOOD_SND1;
else
st->codec->codec_id = CODEC_ID_ADPCM_IMA_WS;
st->codec->codec_tag = 0; /* no tag */
st->codec->sample_rate = LE_16(&header[24]);
if (!st->codec->sample_rate)
st->codec->sample_rate = 22050;
st->codec->channels = header[26];
if (!st->codec->channels)
st->codec->channels = 1;
st->codec->bits_per_sample = 16;
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
st->codec->bits_per_sample / 4;
@ -284,6 +296,7 @@ static int wsvqa_read_header(AVFormatContext *s,
case PINH_TAG:
case PIND_TAG:
case FINF_TAG:
case CMDS_TAG:
break;
default:
@ -306,48 +319,66 @@ static int wsvqa_read_packet(AVFormatContext *s,
{
WsVqaDemuxContext *wsvqa = (WsVqaDemuxContext *)s->priv_data;
ByteIOContext *pb = &s->pb;
int ret = 0;
int ret = -1;
unsigned char preamble[VQA_PREAMBLE_SIZE];
unsigned int chunk_type;
unsigned int chunk_size;
int skip_byte;
if (get_buffer(pb, preamble, VQA_PREAMBLE_SIZE) != VQA_PREAMBLE_SIZE)
return AVERROR_IO;
while (get_buffer(pb, preamble, VQA_PREAMBLE_SIZE) == VQA_PREAMBLE_SIZE) {
chunk_type = BE_32(&preamble[0]);
chunk_size = BE_32(&preamble[4]);
skip_byte = chunk_size & 0x01;
chunk_type = BE_32(&preamble[0]);
chunk_size = BE_32(&preamble[4]);
skip_byte = chunk_size & 0x01;
if ((chunk_type == SND1_TAG) || (chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) {
if ((chunk_type == SND2_TAG) || (chunk_type == VQFR_TAG)) {
if (av_new_packet(pkt, chunk_size))
return AVERROR_IO;
ret = get_buffer(pb, pkt->data, chunk_size);
if (ret != chunk_size) {
av_free_packet(pkt);
return AVERROR_IO;
}
av_get_packet(pb, pkt, chunk_size);
if (ret != chunk_size) {
ret = AVERROR_IO;
}
if (chunk_type == SND2_TAG) {
pkt->stream_index = wsvqa->audio_stream_index;
if (chunk_type == SND2_TAG) {
pkt->stream_index = wsvqa->audio_stream_index;
pkt->pts = 90000;
pkt->pts *= wsvqa->audio_frame_counter;
pkt->pts /= wsvqa->audio_samplerate;
pkt->pts = 90000;
pkt->pts *= wsvqa->audio_frame_counter;
pkt->pts /= wsvqa->audio_samplerate;
/* 2 samples/byte, 1 or 2 samples per frame depending on stereo */
wsvqa->audio_frame_counter += (chunk_size * 2) / wsvqa->audio_channels;
} else if(chunk_type == SND1_TAG) {
pkt->stream_index = wsvqa->audio_stream_index;
/* 2 samples/byte, 1 or 2 samples per frame depending on stereo */
wsvqa->audio_frame_counter += (chunk_size * 2) /
wsvqa->audio_channels;
pkt->pts = 90000;
pkt->pts *= wsvqa->audio_frame_counter;
pkt->pts /= wsvqa->audio_samplerate;
/* unpacked size is stored in header */
wsvqa->audio_frame_counter += LE_16(pkt->data) / wsvqa->audio_channels;
} else {
pkt->stream_index = wsvqa->video_stream_index;
pkt->pts = wsvqa->video_pts;
wsvqa->video_pts += VQA_VIDEO_PTS_INC;
}
/* stay on 16-bit alignment */
if (skip_byte)
url_fseek(pb, 1, SEEK_CUR);
return ret;
} else {
pkt->stream_index = wsvqa->video_stream_index;
pkt->pts = wsvqa->video_pts;
wsvqa->video_pts += VQA_VIDEO_PTS_INC;
switch(chunk_type){
case CMDS_TAG:
case SND0_TAG:
break;
default:
av_log(s, AV_LOG_INFO, "Skipping unknown chunk 0x%08X\n", chunk_type);
}
url_fseek(pb, chunk_size + skip_byte, SEEK_CUR);
}
} else
return AVERROR_INVALIDDATA;
/* stay on 16-bit alignment */
if (skip_byte)
url_fseek(pb, 1, SEEK_CUR);
}
return ret;
}