static int ac3_eac3_probe(AVProbeData *p, enum CodecID expected_codec_id)
{
int max_frames, first_frames = 0, frames;
uint8_t *buf, *buf2, *end;
AC3HeaderInfo hdr;
GetBitContext gbc;
enum CodecID codec_id = CODEC_ID_AC3;
max_frames = 0;
buf = p->buf;
end = buf + p->buf_size;
for(; buf < end; buf++) {
buf2 = buf;
for(frames = 0; buf2 < end; frames++) {
if(!memcmp(buf2, "\x1\x10\0\0\0\0\0\0", 8))
buf2+=16;
init_get_bits(&gbc, buf2, 54);
if(avpriv_ac3_parse_header(&gbc, &hdr) < 0)
break;
if(buf2 + hdr.frame_size > end ||
av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, buf2 + 2, hdr.frame_size - 2))
break;
if (hdr.bitstream_id > 10)
codec_id = CODEC_ID_EAC3;
buf2 += hdr.frame_size;
}
max_frames = FFMAX(max_frames, frames);
if(buf == p->buf)
first_frames = frames;
}
if(codec_id != expected_codec_id) return 0;
// keep this in sync with mp3 probe, both need to avoid
// issues with MPEG-files!
if (first_frames>=4) return AVPROBE_SCORE_MAX/2+1;
else if(max_frames>200)return AVPROBE_SCORE_MAX/2;
else if(max_frames>=4) return AVPROBE_SCORE_MAX/4;
else if(max_frames>=1) return 1;
else return 0;
}
static int ac3_eac3_probe(AVProbeData *p, enum AVCodecID expected_codec_id)
{
int max_frames, first_frames = 0, frames;
uint8_t *buf, *buf2, *end;
AC3HeaderInfo hdr;
GetBitContext gbc;
enum AVCodecID codec_id = AV_CODEC_ID_AC3;
max_frames = 0;
buf = p->buf;
end = buf + p->buf_size;
for(; buf < end; buf++) {
if(buf > p->buf && !(buf[0] == 0x0B && buf[1] == 0x77)
&& !(buf[0] == 0x77 && buf[1] == 0x0B) )
continue;
buf2 = buf;
for(frames = 0; buf2 < end; frames++) {
uint8_t buf3[4096];
int i;
if(!memcmp(buf2, "\x1\x10\0\0\0\0\0\0", 8))
buf2+=16;
if (buf[0] == 0x77 && buf[1] == 0x0B) {
for(i=0; i<8; i+=2) {
buf3[i ] = buf[i+1];
buf3[i+1] = buf[i ];
}
init_get_bits(&gbc, buf3, 54);
}else
init_get_bits(&gbc, buf2, 54);
if(avpriv_ac3_parse_header(&gbc, &hdr) < 0)
break;
if(buf2 + hdr.frame_size > end)
break;
if (buf[0] == 0x77 && buf[1] == 0x0B) {
av_assert0(hdr.frame_size <= sizeof(buf3));
for(i=8; i<hdr.frame_size; i+=2) {
buf3[i ] = buf[i+1];
buf3[i+1] = buf[i ];
}
}
if(av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, gbc.buffer + 2, hdr.frame_size - 2))
break;
if (hdr.bitstream_id > 10)
codec_id = AV_CODEC_ID_EAC3;
buf2 += hdr.frame_size;
}
max_frames = FFMAX(max_frames, frames);
if(buf == p->buf)
first_frames = frames;
}
if(codec_id != expected_codec_id) return 0;
// keep this in sync with mp3 probe, both need to avoid
// issues with MPEG-files!
if (first_frames>=4) return AVPROBE_SCORE_MAX/2+1;
else if(max_frames>200)return AVPROBE_SCORE_MAX/2;
else if(max_frames>=4) return AVPROBE_SCORE_MAX/4;
else if(max_frames>=1) return 1;
else return 0;
}
static av_cold int ffat_create_decoder(AVCodecContext *avctx, AVPacket *pkt)
{
ATDecodeContext *at = avctx->priv_data;
OSStatus status;
int i;
enum AVSampleFormat sample_fmt = (avctx->bits_per_raw_sample == 32) ?
AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S16;
AudioStreamBasicDescription in_format = {
.mFormatID = ffat_get_format_id(avctx->codec_id, avctx->profile),
.mBytesPerPacket = (avctx->codec_id == AV_CODEC_ID_ILBC) ? avctx->block_align : 0,
};
AudioStreamBasicDescription out_format = {
.mFormatID = kAudioFormatLinearPCM,
.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked,
.mFramesPerPacket = 1,
.mBitsPerChannel = av_get_bytes_per_sample(sample_fmt) * 8,
};
avctx->sample_fmt = sample_fmt;
if (ffat_usable_extradata(avctx)) {
UInt32 format_size = sizeof(in_format);
UInt32 cookie_size;
uint8_t *cookie = ffat_get_magic_cookie(avctx, &cookie_size);
if (!cookie)
return AVERROR(ENOMEM);
status = AudioFormatGetProperty(kAudioFormatProperty_FormatInfo,
cookie_size, cookie, &format_size, &in_format);
if (cookie != at->extradata)
av_free(cookie);
if (status != 0) {
av_log(avctx, AV_LOG_ERROR, "AudioToolbox header-parse error: %i\n", (int)status);
return AVERROR_UNKNOWN;
}
#if CONFIG_MP1_AT_DECODER || CONFIG_MP2_AT_DECODER || CONFIG_MP3_AT_DECODER
} else if (pkt && pkt->size >= 4 &&
(avctx->codec_id == AV_CODEC_ID_MP1 ||
avctx->codec_id == AV_CODEC_ID_MP2 ||
avctx->codec_id == AV_CODEC_ID_MP3)) {
enum AVCodecID codec_id;
int bit_rate;
if (ff_mpa_decode_header(AV_RB32(pkt->data), &avctx->sample_rate,
&in_format.mChannelsPerFrame, &avctx->frame_size,
&bit_rate, &codec_id) < 0)
return AVERROR_INVALIDDATA;
avctx->bit_rate = bit_rate;
in_format.mSampleRate = avctx->sample_rate;
#endif
#if CONFIG_AC3_AT_DECODER || CONFIG_EAC3_AT_DECODER
} else if (pkt && pkt->size >= 7 &&
(avctx->codec_id == AV_CODEC_ID_AC3 ||
avctx->codec_id == AV_CODEC_ID_EAC3)) {
AC3HeaderInfo hdr, *phdr = &hdr;
GetBitContext gbc;
init_get_bits(&gbc, pkt->data, pkt->size);
if (avpriv_ac3_parse_header(&gbc, &phdr) < 0)
return AVERROR_INVALIDDATA;
in_format.mSampleRate = hdr.sample_rate;
in_format.mChannelsPerFrame = hdr.channels;
avctx->frame_size = hdr.num_blocks * 256;
avctx->bit_rate = hdr.bit_rate;
#endif
} else {
in_format.mSampleRate = avctx->sample_rate ? avctx->sample_rate : 44100;
in_format.mChannelsPerFrame = avctx->channels ? avctx->channels : 1;
}
avctx->sample_rate = out_format.mSampleRate = in_format.mSampleRate;
avctx->channels = out_format.mChannelsPerFrame = in_format.mChannelsPerFrame;
if (avctx->codec_id == AV_CODEC_ID_ADPCM_IMA_QT)
in_format.mFramesPerPacket = 64;
status = AudioConverterNew(&in_format, &out_format, &at->converter);
if (status != 0) {
av_log(avctx, AV_LOG_ERROR, "AudioToolbox init error: %i\n", (int)status);
return AVERROR_UNKNOWN;
}
if ((status = ffat_set_extradata(avctx)) < 0)
return status;
for (i = 0; i < (sizeof(at->channel_map) / sizeof(at->channel_map[0])); i++)
at->channel_map[i] = i;
ffat_update_ctx(avctx);
if(!(at->decoded_data = av_malloc(av_get_bytes_per_sample(avctx->sample_fmt)
* avctx->frame_size * avctx->channels)))
return AVERROR(ENOMEM);
at->last_pts = AV_NOPTS_VALUE;
return 0;
}
static av_cold int ffat_init_decoder(AVCodecContext *avctx)
{
ATDecodeContext *at = avctx->priv_data;
at->extradata = avctx->extradata;
at->extradata_size = avctx->extradata_size;
if ((avctx->channels && avctx->sample_rate) || ffat_usable_extradata(avctx))
return ffat_create_decoder(avctx, NULL);
else
return 0;
}
static OSStatus ffat_decode_callback(AudioConverterRef converter, UInt32 *nb_packets,
AudioBufferList *data,
AudioStreamPacketDescription **packets,
void *inctx)
{
AVCodecContext *avctx = inctx;
ATDecodeContext *at = avctx->priv_data;
if (at->eof) {
*nb_packets = 0;
if (packets) {
*packets = &at->pkt_desc;
at->pkt_desc.mDataByteSize = 0;
}
return 0;
}
av_packet_unref(&at->in_pkt);
av_packet_move_ref(&at->in_pkt, &at->new_in_pkt);
if (!at->in_pkt.data) {
*nb_packets = 0;
return 1;
}
data->mNumberBuffers = 1;
data->mBuffers[0].mNumberChannels = 0;
data->mBuffers[0].mDataByteSize = at->in_pkt.size;
data->mBuffers[0].mData = at->in_pkt.data;
*nb_packets = 1;
if (packets) {
*packets = &at->pkt_desc;
at->pkt_desc.mDataByteSize = at->in_pkt.size;
}
return 0;
}
