d54811fe22
playback.c. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6986 a1c6a512-1295-4272-9138-f99709370657
257 lines
8.7 KiB
C
257 lines
8.7 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 <codecs/libmad/mad.h>
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#include "playback.h"
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#include "dsp.h"
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#include "mp3data.h"
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#include "lib/codeclib.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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mad_timer_t Timer;
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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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#define OUTPUT_BUFFER_SIZE 65536 /* Must be an integer multiple of 4. */
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unsigned char OutputBuffer[OUTPUT_BUFFER_SIZE];
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unsigned char *OutputPtr;
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unsigned char *GuardPtr = NULL;
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const unsigned char *OutputBufferEnd = OutputBuffer + OUTPUT_BUFFER_SIZE;
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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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/* 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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struct codec_api *ci = api;
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struct mp3info *info;
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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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char *InputBuffer;
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unsigned int samplecount;
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unsigned int samplesdone;
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bool first_frame;
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int stop_skip, start_skip;
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int current_stereo_mode = -1;
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int frequency_divider;
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/* Generic codec inititialisation */
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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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/* This function sets up the buffers and reads the file into RAM */
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if (codec_init(api)) {
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return CODEC_ERROR;
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}
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/* Create a decoder instance */
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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->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(DSP_DITHER, (bool *)false);
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ci->configure(CODEC_DSP_ENABLE, (bool *)true);
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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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ci->memset(&Timer, 0, sizeof(mad_timer_t));
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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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mad_timer_reset(&Timer);
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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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info = ci->mp3data;
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first_frame = false;
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file_end = 0;
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OutputPtr = OutputBuffer;
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frequency_divider = ci->id3->frequency / 100;
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while (!*ci->taginfo_ready)
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ci->yield();
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ci->configure(DSP_SET_FREQUENCY, (int *)ci->id3->frequency);
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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 (info->enc_delay >= 0 && info->enc_padding >= 0) {
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stop_skip = info->enc_padding - mpeg_latency[info->layer];
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if (stop_skip < 0) stop_skip = 0;
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start_skip = info->enc_delay + mpeg_latency[info->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[info->layer];
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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 libmad just can't supply us with
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all the data we need... */
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if (info->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 = info->frame_count*1152 - (start_skip + stop_skip);
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samplesdone = ci->id3->elapsed * frequency_divider / 10;
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} else {
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samplecount = ci->id3->length * frequency_divider / 10;
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samplesdone = ci->id3->elapsed * frequency_divider / 10;
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}
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/* This is the decoding loop. */
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while (1) {
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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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}
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if (ci->seek_time) {
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unsigned int sample_loc;
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int newpos;
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sample_loc = ci->seek_time * frequency_divider / 10;
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newpos = ci->mp3_get_filepos(ci->seek_time-1);
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if (sample_loc >= samplecount + samplesdone)
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break ;
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if (ci->seek_buffer(newpos)) {
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samplecount += samplesdone - sample_loc;
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samplesdone = sample_loc;
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}
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ci->seek_time = 0;
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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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{
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if (Stream.error == MAD_FLAG_INCOMPLETE || Stream.error == MAD_ERROR_BUFLEN) {
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// ci->splash(HZ*1, true, "Incomplete");
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/* This makes the codec to support partially corrupted files too. */
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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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}
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else if(MAD_RECOVERABLE(Stream.error))
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{
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if(Stream.error!=MAD_ERROR_LOSTSYNC || Stream.this_frame!=GuardPtr)
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{
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// rb->splash(HZ*1, true, "Recoverable...!");
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}
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continue;
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}
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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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}
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if (Stream.next_frame)
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ci->advance_buffer_loc((void *)Stream.next_frame);
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file_end = false;
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/* ?? Do we need the timer module? */
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// mad_timer_add(&Timer,Frame.header.duration);
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mad_synth_frame(&Synth,&Frame);
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/* Convert MAD's numbers to an array of 16-bit LE signed integers */
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/* We skip start_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 start_skip to exceed one frames worth of samples? */
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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->audiobuffer_insert_split(&Synth.pcm.samples[0][start_skip],
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&Synth.pcm.samples[1][start_skip],
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(Synth.pcm.length - start_skip) * 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->audiobuffer_insert((char *)&Synth.pcm.samples[0][start_skip],
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(Synth.pcm.length - start_skip) * 4);
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}
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start_skip = 0; /* not very elegant, and might want to keep this value */
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samplesdone += Synth.pcm.length;
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samplecount -= Synth.pcm.length;
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ci->set_elapsed(samplesdone / (frequency_divider / 10));
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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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