PyObject*
encoders_encode_alac(PyObject *dummy, PyObject *args, PyObject *keywds)
{
static char *kwlist[] = {"file",
"pcmreader",
"block_size",
"initial_history",
"history_multiplier",
"maximum_k",
"minimum_interlacing_leftweight",
"maximum_interlacing_leftweight",
NULL};
PyObject *file_obj;
FILE *output_file;
BitstreamWriter *output = NULL;
PyObject *pcmreader_obj;
pcmreader* pcmreader;
struct alac_context encoder;
array_ia* channels = array_ia_new();
unsigned frame_file_offset;
PyObject *log_output;
alacenc_init_encoder(&encoder);
encoder.options.minimum_interlacing_leftweight = 0;
encoder.options.maximum_interlacing_leftweight = 4;
/*extract a file object, PCMReader-compatible object and encoding options*/
if (!PyArg_ParseTupleAndKeywords(
args, keywds, "OOiiii|ii",
kwlist,
&file_obj,
&pcmreader_obj,
&(encoder.options.block_size),
&(encoder.options.initial_history),
&(encoder.options.history_multiplier),
&(encoder.options.maximum_k),
&(encoder.options.minimum_interlacing_leftweight),
&(encoder.options.maximum_interlacing_leftweight)))
return NULL;
/*transform the Python PCMReader-compatible object to a pcm_reader struct*/
if ((pcmreader = open_pcmreader(pcmreader_obj)) == NULL) {
return NULL;
}
encoder.bits_per_sample = pcmreader->bits_per_sample;
/*determine if the PCMReader is compatible with ALAC*/
if ((pcmreader->bits_per_sample != 16) &&
(pcmreader->bits_per_sample != 24)) {
PyErr_SetString(PyExc_ValueError, "bits per sample must be 16 or 24");
goto error;
}
/*convert file object to bitstream writer*/
if ((output_file = PyFile_AsFile(file_obj)) == NULL) {
PyErr_SetString(PyExc_TypeError,
"file must by a concrete file object");
goto error;
} else {
output = bw_open(output_file, BS_BIG_ENDIAN);
bw_add_callback(output,
alac_byte_counter,
&(encoder.mdat_byte_size));
}
#else
int
ALACEncoder_encode_alac(char *filename,
FILE *input,
int block_size,
int initial_history,
int history_multiplier,
int maximum_k)
{
FILE *output_file;
BitstreamWriter *output = NULL;
pcmreader *pcmreader;
struct alac_context encoder;
array_ia* channels = array_ia_new();
unsigned frame_file_offset;
alacenc_init_encoder(&encoder);
encoder.options.block_size = block_size;
encoder.options.initial_history = initial_history;
encoder.options.history_multiplier = history_multiplier;
encoder.options.maximum_k = maximum_k;
encoder.options.minimum_interlacing_leftweight = 0;
encoder.options.maximum_interlacing_leftweight = 4;
output_file = fopen(filename, "wb");
/*assume CD quality for now*/
pcmreader = open_pcmreader(input, 44100, 2, 0x3, 16, 0, 1);
encoder.bits_per_sample = pcmreader->bits_per_sample;
/*convert file object to bitstream writer*/
output = bw_open(output_file, BS_BIG_ENDIAN);
bw_add_callback(output,
alac_byte_counter,
&(encoder.mdat_byte_size));
#endif
/*write placeholder mdat header*/
output->write(output, 32, 0);
output->write_bytes(output, (uint8_t*)"mdat", 4);
/*write frames from pcm_reader until empty*/
if (pcmreader->read(pcmreader, encoder.options.block_size, channels))
goto error;
while (channels->_[0]->size > 0) {
#ifndef STANDALONE
Py_BEGIN_ALLOW_THREADS
#endif
/*log the number of PCM frames in each ALAC frameset*/
encoder.frame_log->_[LOG_SAMPLE_SIZE]->append(
encoder.frame_log->_[LOG_SAMPLE_SIZE],
channels->_[0]->size);
frame_file_offset = encoder.mdat_byte_size;
/*log each frameset's starting offset in the mdat atom*/
encoder.frame_log->_[LOG_FILE_OFFSET]->append(
encoder.frame_log->_[LOG_FILE_OFFSET],
frame_file_offset);
alac_write_frameset(output, &encoder, channels);
/*log each frame's total size in bytes*/
encoder.frame_log->_[LOG_BYTE_SIZE]->append(
encoder.frame_log->_[LOG_BYTE_SIZE],
encoder.mdat_byte_size - frame_file_offset);
#ifndef STANDALONE
Py_END_ALLOW_THREADS
#endif
if (pcmreader->read(pcmreader, encoder.options.block_size, channels))
goto error;
}
/*return to header and rewrite it with the actual value*/
bw_pop_callback(output, NULL);
fseek(output_file, 0, 0);
output->write(output, 32, encoder.mdat_byte_size);
/*close and free allocated files/buffers,
which varies depending on whether we're running standlone or not*/
#ifndef STANDALONE
log_output = alac_log_output(&encoder);
pcmreader->del(pcmreader);
output->free(output);
alacenc_free_encoder(&encoder);
channels->del(channels);
return log_output;
error:
pcmreader->del(pcmreader);
output->free(output);
alacenc_free_encoder(&encoder);
channels->del(channels);
return NULL;
}
static result_t
encode_opus_file(char *filename, pcmreader *pcmreader,
int quality, unsigned original_sample_rate)
{
const int multichannel = (pcmreader->channels > 2);
const unsigned channel_mapping = (pcmreader->channels > 8 ? 255 :
pcmreader->channels > 2);
int stream_count;
int coupled_stream_count;
unsigned char stream_map[255];
result_t result = ENCODE_OK;
FILE *output_file = NULL;
ogg_stream_state ogg_stream;
ogg_page ogg_page;
OpusEncoder *opus_encoder = NULL;
OpusMSEncoder *opus_ms_encoder = NULL;
int error;
aa_int *samples = NULL;
opus_int16 *opus_samples = NULL;
unsigned char opus_frame[OPUS_FRAME_LEN];
ogg_int64_t granulepos = 0;
ogg_int64_t packetno = 0;
opus_int32 preskip;
/*open output file for writing*/
if ((output_file = fopen(filename, "w+b")) == NULL) {
return ERR_IOERROR;
}
if (!multichannel) {
if ((opus_encoder = opus_encoder_create(48000,
pcmreader->channels,
OPUS_APPLICATION_AUDIO,
&error)) == NULL) {
fclose(output_file);
return ERR_ENCODER_INIT;
}
opus_encoder_ctl(opus_encoder, OPUS_SET_COMPLEXITY(quality));
opus_encoder_ctl(opus_encoder, OPUS_GET_LOOKAHEAD(&preskip));
} else {
if ((opus_ms_encoder =
opus_multistream_surround_encoder_create(
48000,
pcmreader->channels,
channel_mapping,
&stream_count,
&coupled_stream_count,
stream_map,
OPUS_APPLICATION_AUDIO,
&error)) == NULL) {
fclose(output_file);
return ERR_ENCODER_INIT;
}
opus_multistream_encoder_ctl(opus_ms_encoder,
OPUS_SET_COMPLEXITY(quality));
opus_multistream_encoder_ctl(opus_ms_encoder,
OPUS_GET_LOOKAHEAD(&preskip));
}
srand((unsigned)time(NULL));
ogg_stream_init(&ogg_stream, rand());
/*write header and comment packets to Ogg stream*/
{
BitstreamWriter *header = bw_open_recorder(BS_LITTLE_ENDIAN);
BitstreamWriter *comment = bw_open_recorder(BS_LITTLE_ENDIAN);
int i;
/*write header packet to Ogg stream*/
const char opushead[] = "OpusHead";
const char opuscomment[] = "OpusTags";
const char *vendor_string = opus_get_version_string();
const size_t vendor_string_len = strlen(vendor_string);
ogg_packet packet_head;
ogg_packet packet_tags;
header->write_bytes(header,
(uint8_t*)opushead,
(unsigned)strlen(opushead));
header->write(header, 8, 1); /*version*/
header->write(header, 8, pcmreader->channels);
header->write(header, 16, preskip);
header->write(header, 32, original_sample_rate);
header->write(header, 16, 0); /*output gain*/
header->write(header, 8, channel_mapping);
if (channel_mapping != 0) {
header->write(header, 8, stream_count);
header->write(header, 8, coupled_stream_count);
for (i = 0; i < pcmreader->channels; i++) {
header->write(header, 8, stream_map[i]);
}
}
packet_head.packet = BUF_WINDOW_START(header->output.buffer);
packet_head.bytes = BUF_WINDOW_SIZE(header->output.buffer);
packet_head.b_o_s = 1;
packet_head.e_o_s = 0;
packet_head.granulepos = 0;
packet_head.packetno = packetno++;
ogg_stream_packetin(&ogg_stream, &packet_head);
for (i = ogg_stream_flush(&ogg_stream, &ogg_page);
i != 0;
i = ogg_stream_flush(&ogg_stream, &ogg_page)) {
fwrite(ogg_page.header, 1, ogg_page.header_len, output_file);
fwrite(ogg_page.body, 1, ogg_page.body_len, output_file);
}
/*write comment packet to Ogg stream*/
comment->write_bytes(comment,
(uint8_t*)opuscomment,
(unsigned)strlen(opuscomment));
comment->write(comment, 32, (unsigned)vendor_string_len);
comment->write_bytes(comment,
(uint8_t*)vendor_string,
(unsigned)vendor_string_len);
comment->write(comment, 32, 0);
packet_tags.packet = BUF_WINDOW_START(comment->output.buffer);
packet_tags.bytes = BUF_WINDOW_SIZE(comment->output.buffer);
packet_tags.b_o_s = 0;
packet_tags.e_o_s = 0;
packet_tags.granulepos = 0;
packet_tags.packetno = packetno++;
ogg_stream_packetin(&ogg_stream, &packet_tags);
for (i = ogg_stream_flush(&ogg_stream, &ogg_page);
i != 0;
i = ogg_stream_flush(&ogg_stream, &ogg_page)) {
fwrite(ogg_page.header, 1, ogg_page.header_len, output_file);
fwrite(ogg_page.body, 1, ogg_page.body_len, output_file);
}
header->close(header);
comment->close(comment);
}
samples = aa_int_new();
opus_samples = malloc(sizeof(opus_int16) *
pcmreader->channels *
BLOCK_SIZE);
/*for each non-empty FrameList from PCMReader, encode Opus frame*/
if (pcmreader->read(pcmreader, BLOCK_SIZE, samples)) {
result = ERR_PCMREADER;
goto cleanup;
} else if (samples->_[0]->len > BLOCK_SIZE) {
result = ERR_BLOCK_SIZE;
goto cleanup;
}
while (samples->_[0]->len > 0) {
const int short_framelist = (samples->_[0]->len < BLOCK_SIZE);
unsigned c;
opus_int32 encoded_size;
ogg_packet packet;
granulepos += samples->_[0]->len;
/*pad FrameList with additional null samples if necessary*/
for (c = 0; c < samples->len; c++) {
a_int *channel = samples->_[c];
channel->mappend(channel, BLOCK_SIZE - samples->_[0]->len, 0);
}
/*rearrange channels to Vorbis order if necessary*/
reorder_channels(pcmreader->channel_mask, samples);
/*place samples in interleaved buffer*/
for (c = 0; c < samples->len; c++) {
unsigned i;
a_int *channel = samples->_[c];
for (i = 0; i < channel->len; i++) {
opus_samples[c + (i * samples->len)] =
(opus_int16)channel->_[i];
}
}
/*call opus_encode on interleaved buffer to get next packet*/
if (!multichannel) {
encoded_size = opus_encode(opus_encoder,
opus_samples,
samples->_[0]->len,
opus_frame,
OPUS_FRAME_LEN);
} else {
encoded_size = opus_multistream_encode(opus_ms_encoder,
opus_samples,
samples->_[0]->len,
opus_frame,
OPUS_FRAME_LEN);
}
/*get next FrameList to encode*/
if (pcmreader->read(pcmreader, BLOCK_SIZE, samples)) {
result = ERR_PCMREADER;
goto cleanup;
} else if (samples->_[0]->len > BLOCK_SIZE) {
result = ERR_BLOCK_SIZE;
goto cleanup;
}
/*dump Opus packet to Ogg stream*/
/*do this *after* reading the next FrameList in order to detect
the end of stream properly based on whether the FrameList
has no frames*/
packet.packet = (unsigned char *)opus_frame;
packet.bytes = encoded_size;
packet.b_o_s = 0;
packet.e_o_s = (short_framelist || (samples->_[0]->len == 0));
packet.granulepos = granulepos;
packet.packetno = packetno;
ogg_stream_packetin(&ogg_stream, &packet);
while (ogg_stream_pageout(&ogg_stream, &ogg_page)) {
fwrite(ogg_page.header, 1, ogg_page.header_len, output_file);
fwrite(ogg_page.body, 1, ogg_page.body_len, output_file);
}
}
/*flush any remaining Ogg pages to disk*/
while (ogg_stream_flush(&ogg_stream, &ogg_page)) {
fwrite(ogg_page.header, 1, ogg_page.header_len, output_file);
fwrite(ogg_page.body, 1, ogg_page.body_len, output_file);
}
cleanup:
fclose(output_file);
ogg_stream_clear(&ogg_stream);
if (!multichannel) {
opus_encoder_destroy(opus_encoder);
} else {
opus_multistream_encoder_destroy(opus_ms_encoder);
}
samples->del(samples);
free(opus_samples);
return result;
}