file_status_e
avi_reader_c::read_audio(avi_demuxer_t &demuxer) {
AVI_set_audio_track(m_avi, demuxer.m_aid);
while (true) {
int size = AVI_audio_size(m_avi, AVI_get_audio_position_index(m_avi));
if (-1 == size)
return flush_packetizer(demuxer.m_ptzr);
if (!size) {
AVI_set_audio_position_index(m_avi, AVI_get_audio_position_index(m_avi) + 1);
continue;
}
auto chunk = memory_c::alloc(size);
size = AVI_read_audio_chunk(m_avi, reinterpret_cast<char *>(chunk->get_buffer()));
if (0 >= size)
continue;
PTZR(demuxer.m_ptzr)->add_avi_block_size(size);
PTZR(demuxer.m_ptzr)->process(new packet_t(chunk));
m_bytes_processed += size;
return AVI_get_audio_position_index(m_avi) < AVI_max_audio_chunk(m_avi) ? FILE_STATUS_MOREDATA : flush_packetizer(demuxer.m_ptzr);
}
}
file_status_e
avi_reader_c::read_audio(avi_demuxer_t &demuxer) {
AVI_set_audio_track(m_avi, demuxer.m_aid);
while (true) {
int size = AVI_audio_size(m_avi, AVI_get_audio_position_index(m_avi));
// -1 indicates the last chunk.
if (-1 == size)
return flush_packetizer(demuxer.m_ptzr);
// Sanity check. Ignore chunks with obvious wrong size information
// (> 10 MB). Also skip 0-sized blocks. Those are officially
// skipped.
if (!size || (size > AVI_MAX_AUDIO_CHUNK_SIZE)) {
AVI_set_audio_position_index(m_avi, AVI_get_audio_position_index(m_avi) + 1);
continue;
}
auto chunk = memory_c::alloc(size);
size = AVI_read_audio_chunk(m_avi, reinterpret_cast<char *>(chunk->get_buffer()));
if (0 >= size)
continue;
PTZR(demuxer.m_ptzr)->process(new packet_t(chunk));
m_bytes_processed += size;
return AVI_get_audio_position_index(m_avi) < AVI_max_audio_chunk(m_avi) ? FILE_STATUS_MOREDATA : flush_packetizer(demuxer.m_ptzr);
}
}
generic_packetizer_c *
avi_reader_c::create_dts_packetizer(int aid) {
try {
AVI_set_audio_track(m_avi, aid);
long audio_position = AVI_get_audio_position_index(m_avi);
unsigned int num_read = 0;
int dts_position = -1;
byte_buffer_c buffer;
dts_header_t dtsheader;
while ((-1 == dts_position) && (10 > num_read)) {
int chunk_size = AVI_read_audio_chunk(m_avi, nullptr);
if (0 < chunk_size) {
memory_cptr chunk = memory_c::alloc(chunk_size);
AVI_read_audio_chunk(m_avi, reinterpret_cast<char *>(chunk->get_buffer()));
buffer.add(chunk);
dts_position = find_dts_header(buffer.get_buffer(), buffer.get_size(), &dtsheader);
} else {
dts_position = find_dts_header(buffer.get_buffer(), buffer.get_size(), &dtsheader, true);
break;
}
}
if (-1 == dts_position)
throw false;
AVI_set_audio_position_index(m_avi, audio_position);
return new dts_packetizer_c(this, m_ti, dtsheader);
} catch (...) {
mxerror_tid(m_ti.m_fname, aid + 1, Y("Could not find valid DTS headers in this track's first frames.\n"));
return nullptr;
}
}