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ffmpeg.wasm-core
Commit ffa0a3d6 authored by Kostya Shishkov's avatar Kostya Shishkov
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Simplify VMD demuxer (but it still does not work right) 

Originally committed as revision 7001 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent a47d3c04
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Showing with 33 additions and 94 deletions
libavformat/sierravmd.c
View file @ ffa0a3d6
......@@ -45,11 +45,6 @@ typedef struct VmdDemuxContext {
int video_stream_index;
int audio_stream_index;
unsigned int audio_type;
unsigned int audio_samplerate;
unsigned int audio_bits;
unsigned int audio_channels;
unsigned int frame_count;
unsigned int frames_per_block;
vmd_frame_t *frame_table;
......@@ -57,8 +52,6 @@ typedef struct VmdDemuxContext {
int sample_rate;
int64_t audio_sample_counter;
int audio_frame_divisor;
int audio_block_align;
int skiphdr;
unsigned char vmd_header[VMD_HEADER_SIZE];
......@@ -78,79 +71,42 @@ static int vmd_probe(AVProbeData *p)
return AVPROBE_SCORE_MAX / 2;
}
/* This is a support function to determine the duration, in sample
* frames, of a particular audio chunk, taking into account silent
* encodings. */
static int vmd_calculate_audio_duration(unsigned char *audio_chunk,
int audio_chunk_size, int block_align)
{
unsigned char *p = audio_chunk + 16;
unsigned char *p_end = audio_chunk + audio_chunk_size;
int total_samples = 0;
unsigned int sound_flags;
if (audio_chunk_size < 16)
return 0;
if (audio_chunk_size == block_align + 16)
return block_align;
if (audio_chunk_size == block_align + 17)
return block_align;
sound_flags = LE_32(p);
p += 4;
while (p < p_end) {
total_samples += block_align;
if ((sound_flags & 0x01) == 0)
p += block_align;
sound_flags >>= 1;
}
av_log(NULL,0,"Got %i samples for size %i map %08X\n", total_samples, audio_chunk_size, LE_32(audio_chunk));
return total_samples;
}
static int vmd_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
ByteIOContext *pb = &s->pb;
AVStream *st;
AVStream *st, *vst;
unsigned int toc_offset;
unsigned char *raw_frame_table;
int raw_frame_table_size;
offset_t current_offset;
int i, j;
unsigned int total_frames;
int64_t video_pts_inc = 0;
int64_t current_video_pts = 0;
int64_t pts_inc = 1;
int64_t current_video_pts = 0, current_audio_pts = 0;
unsigned char chunk[BYTES_PER_FRAME_RECORD];
int lastframe = 0;
int num, den;
/* fetch the main header, including the 2 header length bytes */
url_fseek(pb, 0, SEEK_SET);
if (get_buffer(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
return AVERROR_IO;
vmd->audio_sample_counter = 0;
vmd->audio_frame_divisor = 1;
vmd->audio_block_align = 1;
/* start up the decoders */
st = av_new_stream(s, 0);
if (!st)
vst = av_new_stream(s, 0);
if (!vst)
return AVERROR_NOMEM;
av_set_pts_info(st, 33, 1, 90000);
vmd->video_stream_index = st->index;
st->codec->codec_type = CODEC_TYPE_VIDEO;
st->codec->codec_id = CODEC_ID_VMDVIDEO;
st->codec->codec_tag = 0; /* no fourcc */
st->codec->width = LE_16(&vmd->vmd_header[12]);
st->codec->height = LE_16(&vmd->vmd_header[14]);
st->codec->time_base.num = 1;
st->codec->time_base.den = 10;
st->codec->extradata_size = VMD_HEADER_SIZE;
st->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
memcpy(st->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
av_set_pts_info(vst, 33, 1, 10);
vmd->video_stream_index = vst->index;
vst->codec->codec_type = CODEC_TYPE_VIDEO;
vst->codec->codec_id = CODEC_ID_VMDVIDEO;
vst->codec->codec_tag = 0; /* no fourcc */
vst->codec->width = LE_16(&vmd->vmd_header[12]);
vst->codec->height = LE_16(&vmd->vmd_header[14]);
vst->codec->extradata_size = VMD_HEADER_SIZE;
vst->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
/* if sample rate is 0, assume no audio */
vmd->sample_rate = LE_16(&vmd->vmd_header[804]);
......@@ -158,35 +114,29 @@ static int vmd_read_header(AVFormatContext *s,
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
av_set_pts_info(st, 33, 1, 90000);
vmd->audio_stream_index = st->index;
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_VMDAUDIO;
st->codec->codec_tag = 0; /* no fourcc */
st->codec->channels = vmd->audio_channels = (vmd->vmd_header[811] & 0x80) ? 2 : 1;
st->codec->channels = (vmd->vmd_header[811] & 0x80) ? 2 : 1;
st->codec->sample_rate = vmd->sample_rate;
st->codec->block_align = vmd->audio_block_align =
LE_16(&vmd->vmd_header[806]);
st->codec->block_align = LE_16(&vmd->vmd_header[806]);
if (st->codec->block_align & 0x8000) {
st->codec->bits_per_sample = 16;
st->codec->block_align = -(st->codec->block_align - 0x10000);
vmd->audio_block_align = -(vmd->audio_block_align - 0x10000);
} else {
st->codec->bits_per_sample = 8;
}
st->codec->bit_rate = st->codec->sample_rate *
st->codec->bits_per_sample * st->codec->channels;
/* for calculating pts */
vmd->audio_frame_divisor = st->codec->channels;
video_pts_inc = 90000;
video_pts_inc *= st->codec->block_align;
video_pts_inc /= st->codec->sample_rate;
video_pts_inc /= st->codec->channels;
} else {
/* if no audio, assume 10 frames/second */
video_pts_inc = 90000 / 10;
/* calculate pts */
num = st->codec->block_align;
den = st->codec->sample_rate * st->codec->channels;
av_reduce(&den, &num, den, num, (1UL<<31)-1);
av_set_pts_info(vst, 33, num, den);
av_set_pts_info(st, 33, num, den);
pts_inc = num;
}
toc_offset = LE_32(&vmd->vmd_header[812]);
......@@ -236,24 +186,23 @@ static int vmd_read_header(AVFormatContext *s,
vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
vmd->frame_table[total_frames].frame_size = size;
memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
vmd->frame_table[total_frames].pts = current_audio_pts;
total_frames++;
/* first audio chunk contains several audio buffers */
current_audio_pts += (current_audio_pts == 0) ? LE_16(&vmd->vmd_header[808]) * pts_inc : pts_inc;
break;
case 2: /* Video Chunk */
vmd->frame_table[total_frames].frame_offset = current_offset;
vmd->frame_table[total_frames].frame_size = size;
vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
vmd->frame_table[total_frames].frame_size = size;
memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
vmd->frame_table[total_frames].pts = current_video_pts;
if (lastframe) {
vmd->frame_table[lastframe].pts = current_video_pts - video_pts_inc;
}
lastframe = total_frames;
total_frames++;
break;
}
current_offset += size;
}
current_video_pts += video_pts_inc;
current_video_pts += pts_inc;
}
av_free(raw_frame_table);
......@@ -291,21 +240,11 @@ static int vmd_read_packet(AVFormatContext *s,
ret = AVERROR_IO;
}
pkt->stream_index = frame->stream_index;
if (frame->frame_record[0] == 0x02)
pkt->pts = frame->pts;
else {
pkt->pts = vmd->audio_sample_counter;
pkt->pts *= 90000;
pkt->pts /= vmd->sample_rate;
pkt->pts /= vmd->audio_channels;
vmd->audio_sample_counter += vmd_calculate_audio_duration(
pkt->data, pkt->size, vmd->audio_block_align);
}
av_log(NULL, AV_LOG_INFO, " dispatching %s frame with %d bytes and pts %"PRId64" (%0.1f sec)\n",
pkt->pts = frame->pts;
av_log(NULL, AV_LOG_INFO, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
(frame->frame_record[0] == 0x02) ? "video" : "audio",
frame->frame_size + BYTES_PER_FRAME_RECORD,
pkt->pts, (float)(pkt->pts / 90000.0));
pkt->pts);
vmd->current_frame++;
......
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