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ffmpeg.wasm-core
Commit 8e7284ba authored by Mike Melanson's avatar Mike Melanson
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dispatch video as well as audio 

Originally committed as revision 1914 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent e2a7bb28
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Showing with 110 additions and 51 deletions
libavformat/4xm.c
View file @ 8e7284ba
......@@ -32,17 +32,12 @@
(((uint8_t*)(x))[2] << 16) | \
(((uint8_t*)(x))[1] << 8) | \
((uint8_t*)(x))[0])
#define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
#define BE_32(x) ((((uint8_t*)(x))[0] << 24) | \
(((uint8_t*)(x))[1] << 16) | \
(((uint8_t*)(x))[2] << 8) | \
((uint8_t*)(x))[3])
#define FOURCC_TAG( ch0, ch1, ch2, ch3 ) \
( (long)(unsigned char)(ch3) | \
( (long)(unsigned char)(ch2) << 8 ) | \
( (long)(unsigned char)(ch1) << 16 ) | \
( (long)(unsigned char)(ch0) << 24 ) )
( (long)(unsigned char)(ch0) | \
( (long)(unsigned char)(ch1) << 8 ) | \
( (long)(unsigned char)(ch2) << 16 ) | \
( (long)(unsigned char)(ch3) << 24 ) )
#define RIFF_TAG FOURCC_TAG('R', 'I', 'F', 'F')
#define _4XMV_TAG FOURCC_TAG('4', 'X', 'M', 'V')
......@@ -65,39 +60,43 @@
#define strk_SIZE 0x28
#define GET_LIST_HEADER() \
fourcc_tag = get_be32(pb); \
fourcc_tag = get_le32(pb); \
size = get_le32(pb); \
if (fourcc_tag != LIST_TAG) \
return AVERROR_INVALIDDATA; \
fourcc_tag = get_be32(pb);
fourcc_tag = get_le32(pb);
typedef struct AudioTrack {
int sample_rate;
int bits;
int channels;
int stream_index;
} AudioTrack;
typedef struct FourxmDemuxContext {
int width;
int height;
int video_stream_index;
int track_count;
AudioTrack *tracks;
int selected_track;
int64_t pts;
int last_chunk_was_audio;
int last_audio_frame_count;
} FourxmDemuxContext;
static int fourxm_probe(AVProbeData *p)
{
if ((BE_32(&p->buf[0]) != RIFF_TAG) ||
(BE_32(&p->buf[8]) != _4XMV_TAG))
if ((LE_32(&p->buf[0]) != RIFF_TAG) ||
(LE_32(&p->buf[8]) != _4XMV_TAG))
return 0;
printf (" detected .4xm file\n");
return AVPROBE_SCORE_MAX;
}
static int fourxm_read_header(AVFormatContext *s,
AVFormatParameters *ap)
AVFormatParameters *ap)
{
ByteIOContext *pb = &s->pb;
unsigned int fourcc_tag;
......@@ -131,7 +130,7 @@ static int fourxm_read_header(AVFormatContext *s,
/* take the lazy approach and search for any and all vtrk and strk chunks */
for (i = 0; i < header_size - 8; i++) {
fourcc_tag = BE_32(&header[i]);
fourcc_tag = LE_32(&header[i]);
size = LE_32(&header[i + 4]);
if (fourcc_tag == vtrk_TAG) {
......@@ -143,6 +142,20 @@ static int fourxm_read_header(AVFormatContext *s,
fourxm->width = LE_32(&header[i + 36]);
fourxm->height = LE_32(&header[i + 40]);
i += 8 + size;
/* allocate a new AVStream */
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
fourxm->video_stream_index = st->index;
st->codec.codec_type = CODEC_TYPE_VIDEO;
st->codec.codec_id = CODEC_ID_4XM;
st->codec.codec_tag = 0; /* no fourcc */
st->codec.width = fourxm->width;
st->codec.height = fourxm->height;
} else if (fourcc_tag == strk_TAG) {
/* check that there is enough data */
if (size != strk_SIZE) {
......@@ -163,6 +176,26 @@ static int fourxm_read_header(AVFormatContext *s,
fourxm->tracks[current_track].sample_rate = LE_32(&header[i + 40]);
fourxm->tracks[current_track].bits = LE_32(&header[i + 44]);
i += 8 + size;
/* allocate a new AVStream */
st = av_new_stream(s, current_track);
if (!st)
return AVERROR_NOMEM;
fourxm->tracks[current_track].stream_index = st->index;
st->codec.codec_type = CODEC_TYPE_AUDIO;
st->codec.codec_tag = 1;
st->codec.channels = fourxm->tracks[current_track].channels;
st->codec.sample_rate = fourxm->tracks[current_track].sample_rate;
st->codec.bits_per_sample = fourxm->tracks[current_track].bits;
st->codec.bit_rate = st->codec.channels * st->codec.sample_rate *
st->codec.bits_per_sample;
st->codec.block_align = st->codec.channels * st->codec.bits_per_sample;
if (st->codec.bits_per_sample == 8)
st->codec.codec_id = CODEC_ID_PCM_U8;
else
st->codec.codec_id = CODEC_ID_PCM_S16LE;
}
}
......@@ -173,30 +206,20 @@ static int fourxm_read_header(AVFormatContext *s,
if (fourcc_tag != MOVI_TAG)
return AVERROR_INVALIDDATA;
if (current_track > -1) {
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
st->codec.codec_type = CODEC_TYPE_AUDIO;
st->codec.codec_tag = 1;
st->codec.channels = fourxm->tracks[current_track].channels;
st->codec.sample_rate = fourxm->tracks[current_track].sample_rate;
st->codec.bits_per_sample = fourxm->tracks[current_track].bits;
st->codec.bit_rate = st->codec.channels * st->codec.sample_rate *
st->codec.bits_per_sample;
st->codec.block_align = st->codec.channels * st->codec.bits_per_sample;
if (st->codec.bits_per_sample == 8)
st->codec.codec_id = CODEC_ID_PCM_U8;
else
st->codec.codec_id = CODEC_ID_PCM_S16LE;
}
/* initialize context members */
fourxm->pts = 0;
fourxm->last_chunk_was_audio = 0;
fourxm->last_audio_frame_count = 0;
/* set the pts reference (1 pts = 1/90000) */
s->pts_num = 1;
s->pts_den = 90000;
return 0;
}
static int fourxm_read_packet(AVFormatContext *s,
AVPacket *pkt)
AVPacket *pkt)
{
FourxmDemuxContext *fourxm = s->priv_data;
ByteIOContext *pb = &s->pb;
......@@ -205,15 +228,19 @@ static int fourxm_read_packet(AVFormatContext *s,
int ret = 0;
int track_number;
int packet_read = 0;
unsigned char header[8];
int64_t pts_inc;
while (!packet_read) {
fourcc_tag = get_be32(pb);
size = get_le32(pb);
if ((ret = get_buffer(&s->pb, header, 8)) < 0)
return ret;
fourcc_tag = LE_32(&header[0]);
size = LE_32(&header[4]);
if (fourcc_tag == LIST_TAG) {
/* skip the LIST-FRAM tag and get the next fourcc */
get_be32(pb);
fourcc_tag = get_be32(pb);
get_le32(pb);
fourcc_tag = get_le32(pb);
size = get_le32(pb);
}
......@@ -223,23 +250,44 @@ static int fourxm_read_packet(AVFormatContext *s,
switch (fourcc_tag) {
case ifrm_TAG:
printf (" %cfrm chunk\n", (char)(fourcc_tag >> 24) & 0xFF);
url_fseek(pb, size, SEEK_CUR);
break;
case pfrm_TAG:
printf (" %cfrm chunk\n", (char)(fourcc_tag >> 24) & 0xFF);
url_fseek(pb, size, SEEK_CUR);
break;
case cfrm_TAG:{
int unknown= get_le32(pb);
int id= get_le32(pb);
int whole= get_le32(pb);
int id, whole;
static int stats[1000];
/* bump the pts if this last data sent out was audio */
if (fourxm->last_chunk_was_audio) {
fourxm->last_chunk_was_audio = 0;
pts_inc = fourxm->last_audio_frame_count;
pts_inc *= 90000;
pts_inc /= fourxm->tracks[fourxm->selected_track].sample_rate;
fourxm->pts += pts_inc;
}
/* allocate 8 more bytes than 'size' to account for fourcc
* and size */
if (av_new_packet(pkt, size + 8))
return -EIO;
pkt->stream_index = fourxm->video_stream_index;
pkt->pts = fourxm->pts;
memcpy(pkt->data, header, 8);
ret = get_buffer(&s->pb, &pkt->data[8], size);
if (fourcc_tag == cfrm_TAG) {
id = LE_32(&pkt->data[12]);
whole = LE_32(&pkt->data[16]);
stats[id] += size - 12;
printf(" cfrm chunk id:%d size:%d whole:%d until now:%d\n", id, size, whole, stats[id]);
url_fseek(pb, size-12, SEEK_CUR);
}
if (ret < 0)
av_free_packet(pkt);
else
packet_read = 1;
break;
}
case snd__TAG:
printf (" snd_ chunk, ");
track_number = get_le32(pb);
......@@ -248,10 +296,21 @@ printf (" snd_ chunk, ");
printf ("correct track, dispatching...\n");
if (av_new_packet(pkt, size))
return -EIO;
pkt->stream_index =
fourxm->tracks[fourxm->selected_track].stream_index;
pkt->pts = fourxm->pts;
ret = get_buffer(&s->pb, pkt->data, size);
if (ret < 0)
av_free_packet(pkt);
packet_read = 1;
else
packet_read = 1;
/* maintain pts info for the benefit of the video track */
fourxm->last_chunk_was_audio = 1;
fourxm->last_audio_frame_count = size /
((fourxm->tracks[fourxm->selected_track].bits / 8) *
fourxm->tracks[fourxm->selected_track].channels);
} else {
printf ("wrong track, skipping...\n");
url_fseek(pb, size, SEEK_CUR);
......
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