0059995326
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7623 a1c6a512-1295-4272-9138-f99709370657
257 lines
8.4 KiB
C
257 lines
8.4 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2005 Dave Chapman
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "codec.h"
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#include "lib/codeclib.h"
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#include <codecs/libmad/mad.h>
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#include <inttypes.h>
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struct mad_stream stream IDATA_ATTR;
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struct mad_frame frame IDATA_ATTR;
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struct mad_synth synth IDATA_ATTR;
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/* The following function is used inside libmad - let's hope it's never
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called.
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*/
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void abort(void) {
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}
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#define INPUT_CHUNK_SIZE 8192
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mad_fixed_t mad_frame_overlap[2][32][18] IDATA_ATTR;
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unsigned char mad_main_data[MAD_BUFFER_MDLEN] IDATA_ATTR;
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/* TODO: what latency does layer 1 have? */
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int mpeg_latency[3] = { 0, 481, 529 };
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#ifdef USE_IRAM
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extern char iramcopy[];
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extern char iramstart[];
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extern char iramend[];
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#endif
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struct codec_api *ci;
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int64_t samplecount;
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int64_t samplesdone;
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int stop_skip, start_skip;
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int current_stereo_mode = -1;
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unsigned int current_frequency = 0;
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void recalc_samplecount(void)
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{
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/* NOTE: currently this doesn't work, the below calculated samples_count
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seems to be right, but sometimes we just don't have all the data we
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need... */
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if (ci->id3->frame_count) {
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/* TODO: 1152 is the frame size in samples for MPEG1 layer 2 and layer 3,
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it's probably not correct at all for MPEG2 and layer 1 */
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samplecount = ((int64_t)ci->id3->frame_count) * 1152;
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} else {
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samplecount = ((int64_t)ci->id3->length) * current_frequency / 1000;
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}
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samplecount -= start_skip + stop_skip;
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}
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/* this is the codec entry point */
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enum codec_status codec_start(struct codec_api *api)
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{
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int status = 0;
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size_t size;
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int file_end;
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int frame_skip;
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char *inputbuffer;
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ci = api;
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TEST_CODEC_API(api);
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#ifdef USE_IRAM
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ci->memcpy(iramstart, iramcopy, iramend - iramstart);
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#endif
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if (codec_init(api))
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return CODEC_ERROR;
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/* Create a decoder instance */
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ci->configure(CODEC_DSP_ENABLE, (bool *)true);
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ci->configure(DSP_DITHER, (bool *)false);
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ci->configure(DSP_SET_CLIP_MIN, (int *)-MAD_F_ONE);
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ci->configure(DSP_SET_CLIP_MAX, (int *)(MAD_F_ONE - 1));
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ci->configure(DSP_SET_SAMPLE_DEPTH, (int *)(MAD_F_FRACBITS));
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ci->configure(CODEC_SET_FILEBUF_LIMIT, (int *)(1024*1024*2));
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ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, (int *)(1024*16));
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ci->memset(&stream, 0, sizeof(struct mad_stream));
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ci->memset(&frame, 0, sizeof(struct mad_frame));
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ci->memset(&synth, 0, sizeof(struct mad_synth));
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mad_stream_init(&stream);
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mad_frame_init(&frame);
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mad_synth_init(&synth);
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/* We do this so libmad doesn't try to call codec_calloc() */
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memset(mad_frame_overlap, 0, sizeof(mad_frame_overlap));
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frame.overlap = &mad_frame_overlap;
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stream.main_data = &mad_main_data;
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/* This label might need to be moved above all the init code, but I don't
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think reiniting the codec is necessary for MPEG. It might even be unwanted
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for gapless playback */
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next_track:
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file_end = 0;
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while (!*ci->taginfo_ready && !ci->stop_codec)
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ci->sleep(1);
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ci->configure(DSP_SET_FREQUENCY, (int *)ci->id3->frequency);
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current_frequency = ci->id3->frequency;
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codec_set_replaygain(ci->id3);
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ci->request_buffer(&size, ci->id3->first_frame_offset);
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ci->advance_buffer(size);
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if (ci->id3->lead_trim >= 0 && ci->id3->tail_trim >= 0) {
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stop_skip = ci->id3->tail_trim - mpeg_latency[ci->id3->layer];
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if (stop_skip < 0) stop_skip = 0;
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start_skip = ci->id3->lead_trim + mpeg_latency[ci->id3->layer];
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} else {
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stop_skip = 0;
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/* We want to skip this amount anyway */
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start_skip = mpeg_latency[ci->id3->layer];
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}
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samplesdone = ((int64_t)ci->id3->elapsed) * current_frequency / 1000;
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frame_skip = start_skip;
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recalc_samplecount();
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/* This is the decoding loop. */
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while (1) {
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int framelength;
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ci->yield();
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if (ci->stop_codec || ci->reload_codec)
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break;
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if (ci->seek_time) {
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int newpos;
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samplesdone = ((int64_t) (ci->seek_time - 1))
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* current_frequency / 1000;
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newpos = ci->mp3_get_filepos(ci->seek_time-1) +
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ci->id3->first_frame_offset;
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if (!ci->seek_buffer(newpos))
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goto next_track;
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if (newpos == 0)
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frame_skip = start_skip;
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ci->seek_complete();
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}
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/* Lock buffers */
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if (stream.error == 0) {
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inputbuffer = ci->request_buffer(&size, INPUT_CHUNK_SIZE);
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if (size == 0 || inputbuffer == NULL)
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break;
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mad_stream_buffer(&stream, inputbuffer, size);
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}
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if (mad_frame_decode(&frame,&stream)) {
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if (stream.error == MAD_FLAG_INCOMPLETE
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|| stream.error == MAD_ERROR_BUFLEN) {
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// ci->splash(HZ*1, true, "Incomplete");
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/* This makes the codec support partially corrupted files */
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if (file_end == 30)
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break;
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/* Fill the buffer */
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stream.error = 0;
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file_end++;
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continue;
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} else if (MAD_RECOVERABLE(stream.error)) {
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if (stream.error != MAD_ERROR_LOSTSYNC) {
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// rb->splash(HZ*1, true, "Recoverable...!");
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}
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continue;
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} else if (stream.error == MAD_ERROR_BUFLEN) {
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//rb->splash(HZ*1, true, "Buflen error");
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break;
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} else {
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//rb->splash(HZ*1, true, "Unrecoverable error");
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status = 1;
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break;
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}
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break;
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}
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file_end = false;
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mad_synth_frame(&synth, &frame);
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framelength = synth.pcm.length - frame_skip;
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/* We skip frame_skip number of samples here, this should only happen for
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very first frame in the stream. */
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/* TODO: possible for frame_skip to exceed one frames worth of samples? */
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if (frame.header.samplerate != current_frequency) {
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current_frequency = frame.header.samplerate;
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ci->configure(DSP_SWITCH_FREQUENCY, (int *)current_frequency);
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recalc_samplecount();
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}
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if (stop_skip > 0) {
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int64_t max = samplecount - samplesdone;
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if (max < 0) max = 0;
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if (max < framelength) framelength = (int)max;
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if (framelength == 0) break;
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}
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if (MAD_NCHANNELS(&frame.header) == 2) {
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if (current_stereo_mode != STEREO_NONINTERLEAVED) {
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ci->configure(DSP_SET_STEREO_MODE, (int *)STEREO_NONINTERLEAVED);
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current_stereo_mode = STEREO_NONINTERLEAVED;
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}
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ci->pcmbuf_insert_split(&synth.pcm.samples[0][frame_skip],
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&synth.pcm.samples[1][frame_skip],
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framelength * 4);
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} else {
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if (current_stereo_mode != STEREO_MONO) {
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ci->configure(DSP_SET_STEREO_MODE, (int *)STEREO_MONO);
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current_stereo_mode = STEREO_MONO;
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}
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ci->pcmbuf_insert((char *)&synth.pcm.samples[0][frame_skip],
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framelength * 4);
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}
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frame_skip = 0;
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if (stream.next_frame)
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ci->advance_buffer_loc((void *)stream.next_frame);
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else
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ci->advance_buffer(size);
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samplesdone += framelength;
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ci->set_elapsed(samplesdone / (current_frequency / 1000));
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}
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stream.error = 0;
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if (ci->request_next_track())
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goto next_track;
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return CODEC_OK;
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}
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