static int ipmovie_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
IPMVEContext *ipmovie = s->priv_data;
AVIOContext *pb = s->pb;
int ret;
for (;;) {
ret = process_ipmovie_chunk(ipmovie, pb, pkt);
if (ret == CHUNK_BAD)
ret = AVERROR_INVALIDDATA;
else if (ret == CHUNK_EOF)
ret = AVERROR(EIO);
else if (ret == CHUNK_NOMEM)
ret = AVERROR(ENOMEM);
else if (ret == CHUNK_VIDEO)
ret = 0;
else if (ret == CHUNK_INIT_VIDEO || ret == CHUNK_INIT_AUDIO)
continue;
else
ret = -1;
return ret;
}
}
static int ipmovie_read_header(AVFormatContext *s)
{
IPMVEContext *ipmovie = s->priv_data;
AVIOContext *pb = s->pb;
AVPacket pkt;
AVStream *st;
unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE];
int chunk_type, i;
uint8_t signature_buffer[sizeof(signature)];
avio_read(pb, signature_buffer, sizeof(signature_buffer));
while (memcmp(signature_buffer, signature, sizeof(signature))) {
memmove(signature_buffer, signature_buffer + 1, sizeof(signature_buffer) - 1);
signature_buffer[sizeof(signature_buffer) - 1] = avio_r8(pb);
if (url_feof(pb))
return AVERROR_EOF;
}
/* initialize private context members */
ipmovie->video_pts = ipmovie->audio_frame_count = 0;
ipmovie->audio_chunk_offset = ipmovie->video_chunk_offset =
ipmovie->decode_map_chunk_offset = 0;
/* on the first read, this will position the stream at the first chunk */
ipmovie->next_chunk_offset = avio_tell(pb) + 4;
for (i = 0; i < 256; i++)
ipmovie->palette[i] = 0xFFU << 24;
/* process the first chunk which should be CHUNK_INIT_VIDEO */
if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_VIDEO)
return AVERROR_INVALIDDATA;
/* peek ahead to the next chunk-- if it is an init audio chunk, process
* it; if it is the first video chunk, this is a silent file */
if (avio_read(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) !=
CHUNK_PREAMBLE_SIZE)
return AVERROR(EIO);
chunk_type = AV_RL16(&chunk_preamble[2]);
avio_seek(pb, -CHUNK_PREAMBLE_SIZE, SEEK_CUR);
if (chunk_type == CHUNK_VIDEO)
ipmovie->audio_type = AV_CODEC_ID_NONE; /* no audio */
else if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO)
return AVERROR_INVALIDDATA;
/* initialize the stream decoders */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 63, 1, 1000000);
ipmovie->video_stream_index = st->index;
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = AV_CODEC_ID_INTERPLAY_VIDEO;
st->codec->codec_tag = 0; /* no fourcc */
st->codec->width = ipmovie->video_width;
st->codec->height = ipmovie->video_height;
st->codec->bits_per_coded_sample = ipmovie->video_bpp;
if (ipmovie->audio_type) {
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 32, 1, ipmovie->audio_sample_rate);
ipmovie->audio_stream_index = st->index;
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = ipmovie->audio_type;
st->codec->codec_tag = 0; /* no tag */
st->codec->channels = ipmovie->audio_channels;
st->codec->channel_layout = st->codec->channels == 1 ? AV_CH_LAYOUT_MONO :
AV_CH_LAYOUT_STEREO;
st->codec->sample_rate = ipmovie->audio_sample_rate;
st->codec->bits_per_coded_sample = ipmovie->audio_bits;
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
st->codec->bits_per_coded_sample;
if (st->codec->codec_id == AV_CODEC_ID_INTERPLAY_DPCM)
st->codec->bit_rate /= 2;
st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
}
return 0;
}
static int ipmovie_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
IPMVEContext *ipmovie = s->priv_data;
ByteIOContext *pb = s->pb;
AVPacket pkt;
AVStream *st;
unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE];
int chunk_type;
/* initialize private context members */
ipmovie->video_pts = ipmovie->audio_frame_count = 0;
ipmovie->audio_chunk_offset = ipmovie->video_chunk_offset =
ipmovie->decode_map_chunk_offset = 0;
/* on the first read, this will position the stream at the first chunk */
ipmovie->next_chunk_offset = IPMOVIE_SIGNATURE_SIZE + 6;
/* process the first chunk which should be CHUNK_INIT_VIDEO */
if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_VIDEO)
return AVERROR_INVALIDDATA;
/* peek ahead to the next chunk-- if it is an init audio chunk, process
* it; if it is the first video chunk, this is a silent file */
if (get_buffer(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) !=
CHUNK_PREAMBLE_SIZE)
return AVERROR(EIO);
chunk_type = AV_RL16(&chunk_preamble[2]);
url_fseek(pb, -CHUNK_PREAMBLE_SIZE, SEEK_CUR);
if (chunk_type == CHUNK_VIDEO)
ipmovie->audio_type = 0; /* no audio */
else if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO)
return AVERROR_INVALIDDATA;
/* initialize the stream decoders */
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
av_set_pts_info(st, 33, 1, 90000);
ipmovie->video_stream_index = st->index;
st->codec->codec_type = CODEC_TYPE_VIDEO;
st->codec->codec_id = CODEC_ID_INTERPLAY_VIDEO;
st->codec->codec_tag = 0; /* no fourcc */
st->codec->width = ipmovie->video_width;
st->codec->height = ipmovie->video_height;
/* palette considerations */
st->codec->palctrl = &ipmovie->palette_control;
if (ipmovie->audio_type) {
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
av_set_pts_info(st, 33, 1, 90000);
ipmovie->audio_stream_index = st->index;
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = ipmovie->audio_type;
st->codec->codec_tag = 0; /* no tag */
st->codec->channels = ipmovie->audio_channels;
st->codec->sample_rate = ipmovie->audio_sample_rate;
st->codec->bits_per_sample = ipmovie->audio_bits;
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
st->codec->bits_per_sample;
if (st->codec->codec_id == CODEC_ID_INTERPLAY_DPCM)
st->codec->bit_rate /= 2;
st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
}
return 0;
}
