static int seq_read_header(AVFormatContext *s)
{
int i, rc;
SeqDemuxContext *seq = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st;
/* init internal buffers */
rc = seq_init_frame_buffers(seq, pb);
if (rc)
return rc;
seq->current_frame_offs = 0;
/* preload (no audio data, just buffer operations related data) */
for (i = 1; i <= 100; i++) {
rc = seq_parse_frame_data(seq, pb);
if (rc)
return rc;
}
seq->current_frame_pts = 0;
seq->audio_buffer_full = 0;
/* initialize the video decoder stream */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 32, 1, SEQ_FRAME_RATE);
seq->video_stream_index = st->index;
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = AV_CODEC_ID_TIERTEXSEQVIDEO;
st->codec->codec_tag = 0; /* no fourcc */
st->codec->width = SEQ_FRAME_W;
st->codec->height = SEQ_FRAME_H;
/* initialize the audio decoder stream */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->start_time = 0;
avpriv_set_pts_info(st, 32, 1, SEQ_SAMPLE_RATE);
seq->audio_stream_index = st->index;
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
st->codec->codec_tag = 0; /* no tag */
st->codec->channels = 1;
st->codec->channel_layout = AV_CH_LAYOUT_MONO;
st->codec->sample_rate = SEQ_SAMPLE_RATE;
st->codec->bits_per_coded_sample = 16;
st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample * st->codec->channels;
st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample / 8;
return 0;
}
static int seq_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int rc;
SeqDemuxContext *seq = s->priv_data;
AVIOContext *pb = s->pb;
if (!seq->audio_buffer_full)
{
rc = seq_parse_frame_data(seq, pb);
if (rc)
return rc;
/* video packet */
if (seq->current_pal_data_size + seq->current_video_data_size != 0)
{
if (av_new_packet(pkt, 1 + seq->current_pal_data_size + seq->current_video_data_size))
return AVERROR(ENOMEM);
pkt->data[0] = 0;
if (seq->current_pal_data_size)
{
pkt->data[0] |= 1;
avio_seek(pb, seq->current_frame_offs + seq->current_pal_data_offs, SEEK_SET);
if (avio_read(pb, &pkt->data[1], seq->current_pal_data_size) != seq->current_pal_data_size)
return AVERROR(EIO);
}
if (seq->current_video_data_size)
{
pkt->data[0] |= 2;
memcpy(&pkt->data[1 + seq->current_pal_data_size],
seq->current_video_data_ptr,
seq->current_video_data_size);
}
pkt->stream_index = seq->video_stream_index;
pkt->pts = seq->current_frame_pts;
/* sound buffer will be processed on next read_packet() call */
seq->audio_buffer_full = 1;
return 0;
}
}
/* audio packet */
if (seq->current_audio_data_offs == 0) /* end of data reached */
return AVERROR(EIO);
avio_seek(pb, seq->current_frame_offs + seq->current_audio_data_offs, SEEK_SET);
rc = av_get_packet(pb, pkt, seq->current_audio_data_size);
if (rc < 0)
return rc;
pkt->stream_index = seq->audio_stream_index;
seq->current_frame_pts++;
seq->audio_buffer_full = 0;
return 0;
}