mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-21 02:45:52 +01:00
111 lines
3.6 KiB
C
111 lines
3.6 KiB
C
#include "../vgmstream.h"
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#if defined(VGM_USE_MP4V2) && defined(VGM_USE_FDKAAC)
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static void convert_samples(INT_PCM * src, sample * dest, int32_t count) {
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int32_t i;
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for ( i = 0; i < count; i++ ) {
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INT_PCM sample = *src++;
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sample >>= SAMPLE_BITS - 16;
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if ( ( sample + 0x8000 ) & 0xFFFF0000 ) sample = 0x7FFF ^ ( sample >> 31 );
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*dest++ = sample;
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}
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}
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void decode_mp4_aac(mp4_aac_codec_data * data, sample * outbuf, int32_t samples_to_do, int channels) {
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int samples_done = 0;
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uint8_t * buffer = NULL;
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uint32_t buffer_size;
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UINT ubuffer_size, bytes_valid;
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CStreamInfo * stream_info = aacDecoder_GetStreamInfo( data->h_aacdecoder );
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int32_t samples_remain = data->samples_per_frame - data->sample_ptr;
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if ( data->samples_discard ) {
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if ( samples_remain <= data->samples_discard ) {
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data->samples_discard -= samples_remain;
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samples_remain = 0;
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}
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else {
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samples_remain -= data->samples_discard;
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data->sample_ptr += data->samples_discard;
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data->samples_discard = 0;
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}
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}
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if ( samples_remain > samples_to_do ) samples_remain = samples_to_do;
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convert_samples( data->sample_buffer + data->sample_ptr * stream_info->numChannels, outbuf, samples_remain * stream_info->numChannels );
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outbuf += samples_remain * stream_info->numChannels;
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data->sample_ptr += samples_remain;
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samples_done += samples_remain;
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while ( samples_done < samples_to_do ) {
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if (data->sampleId >= data->numSamples) {
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memset(outbuf, 0, (samples_to_do - samples_done) * stream_info->numChannels * sizeof(sample));
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break;
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}
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if (!MP4ReadSample( data->h_mp4file, data->track_id, ++data->sampleId, (uint8_t**)(&buffer), (uint32_t*)(&buffer_size), 0, 0, 0, 0)) return;
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ubuffer_size = buffer_size;
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bytes_valid = buffer_size;
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if ( aacDecoder_Fill( data->h_aacdecoder, &buffer, &ubuffer_size, &bytes_valid ) || bytes_valid ) {
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free( buffer );
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return;
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}
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if ( aacDecoder_DecodeFrame( data->h_aacdecoder, data->sample_buffer, ( (6) * (2048)*4 ), 0 ) ) {
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free( buffer );
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return;
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}
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free( buffer ); buffer = NULL;
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stream_info = aacDecoder_GetStreamInfo( data->h_aacdecoder );
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samples_remain = data->samples_per_frame = stream_info->frameSize;
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data->sample_ptr = 0;
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if ( data->samples_discard ) {
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if ( samples_remain <= data->samples_discard ) {
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data->samples_discard -= samples_remain;
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samples_remain = 0;
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}
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else {
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samples_remain -= data->samples_discard;
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data->sample_ptr = data->samples_discard;
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data->samples_discard = 0;
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}
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}
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if ( samples_remain > samples_to_do - samples_done ) samples_remain = samples_to_do - samples_done;
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convert_samples( data->sample_buffer + data->sample_ptr * stream_info->numChannels, outbuf, samples_remain * stream_info->numChannels );
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samples_done += samples_remain;
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outbuf += samples_remain * stream_info->numChannels;
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data->sample_ptr = samples_remain;
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}
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}
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void reset_mp4_aac(VGMSTREAM *vgmstream) {
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mp4_aac_codec_data *data = vgmstream->codec_data;
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data->sampleId = 0;
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data->sample_ptr = data->samples_per_frame;
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data->samples_discard = 0;
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}
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void seek_mp4_aac(VGMSTREAM *vgmstream, int32_t num_sample) {
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mp4_aac_codec_data *data = (mp4_aac_codec_data *)(vgmstream->codec_data);
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data->sampleId = 0;
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data->sample_ptr = data->samples_per_frame;
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data->samples_discard = num_sample;
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}
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void free_mp4_aac(mp4_aac_codec_data * data) {
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if (data) {
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if (data->h_aacdecoder) aacDecoder_Close(data->h_aacdecoder);
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if (data->h_mp4file) MP4Close(data->h_mp4file, 0);
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if (data->if_file.streamfile) close_streamfile(data->if_file.streamfile);
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free(data);
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}
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}
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#endif
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