/* the Music Player Daemon (MPD) * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com) * This project's homepage is: http://www.musicpd.org * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "../decoder_api.h" #ifdef HAVE_MAD #include <mad.h> #ifdef HAVE_ID3TAG #include <id3tag.h> #endif #include "../log.h" #include "../utils.h" #include "../conf.h" #define FRAMES_CUSHION 2000 #define READ_BUFFER_SIZE 40960 enum mp3_action { DECODE_SKIP = -3, DECODE_BREAK = -2, DECODE_CONT = -1, DECODE_OK = 0 }; enum muteframe { MUTEFRAME_NONE, MUTEFRAME_SKIP, MUTEFRAME_SEEK }; /* the number of samples of silence the decoder inserts at start */ #define DECODERDELAY 529 #define DEFAULT_GAPLESS_MP3_PLAYBACK 1 static int gaplessPlaybackEnabled; /* this is stolen from mpg321! */ struct audio_dither { mad_fixed_t error[3]; mad_fixed_t random; }; static unsigned long prng(unsigned long state) { return (state * 0x0019660dL + 0x3c6ef35fL) & 0xffffffffL; } static int16_t audio_linear_dither(unsigned int bits, mad_fixed_t sample, struct audio_dither *dither) { unsigned int scalebits; mad_fixed_t output, mask, rnd; enum { MIN = -MAD_F_ONE, MAX = MAD_F_ONE - 1 }; sample += dither->error[0] - dither->error[1] + dither->error[2]; dither->error[2] = dither->error[1]; dither->error[1] = dither->error[0] / 2; output = sample + (1L << (MAD_F_FRACBITS + 1 - bits - 1)); scalebits = MAD_F_FRACBITS + 1 - bits; mask = (1L << scalebits) - 1; rnd = prng(dither->random); output += (rnd & mask) - (dither->random & mask); dither->random = rnd; if (output > MAX) { output = MAX; if (sample > MAX) sample = MAX; } else if (output < MIN) { output = MIN; if (sample < MIN) sample = MIN; } output &= ~mask; dither->error[0] = sample - output; return (int16_t)(output >> scalebits); } static unsigned dither_buffer(int16_t *dest0, const struct mad_synth *synth, struct audio_dither *dither, unsigned int start, unsigned int end, unsigned int num_channels) { int16_t *dest = dest0; unsigned int i; for (i = start; i < end; ++i) { *dest++ = audio_linear_dither(16, synth->pcm.samples[0][i], dither); if (num_channels == 2) *dest++ = audio_linear_dither(16, synth->pcm.samples[1][i], dither); } return dest - dest0; } /* end of stolen stuff from mpg321 */ static int mp3_plugin_init(void) { gaplessPlaybackEnabled = getBoolConfigParam(CONF_GAPLESS_MP3_PLAYBACK, 1); if (gaplessPlaybackEnabled == CONF_BOOL_UNSET) gaplessPlaybackEnabled = DEFAULT_GAPLESS_MP3_PLAYBACK; return 1; } /* decoder stuff is based on madlld */ #define MP3_DATA_OUTPUT_BUFFER_SIZE 2048 typedef struct _mp3DecodeData { struct mad_stream stream; struct mad_frame frame; struct mad_synth synth; mad_timer_t timer; unsigned char readBuffer[READ_BUFFER_SIZE]; int16_t outputBuffer[MP3_DATA_OUTPUT_BUFFER_SIZE]; float totalTime; float elapsedTime; enum muteframe muteFrame; long *frameOffset; mad_timer_t *times; unsigned long highestFrame; unsigned long maxFrames; unsigned long currentFrame; unsigned int dropFramesAtStart; unsigned int dropFramesAtEnd; unsigned int dropSamplesAtStart; unsigned int dropSamplesAtEnd; int foundXing; int foundFirstFrame; int decodedFirstFrame; unsigned long bitRate; struct decoder *decoder; InputStream *inStream; struct audio_dither dither; enum mad_layer layer; } mp3DecodeData; static void initMp3DecodeData(mp3DecodeData * data, struct decoder *decoder, InputStream * inStream) { data->muteFrame = MUTEFRAME_NONE; data->highestFrame = 0; data->maxFrames = 0; data->frameOffset = NULL; data->times = NULL; data->currentFrame = 0; data->dropFramesAtStart = 0; data->dropFramesAtEnd = 0; data->dropSamplesAtStart = 0; data->dropSamplesAtEnd = 0; data->foundXing = 0; data->foundFirstFrame = 0; data->decodedFirstFrame = 0; data->decoder = decoder; data->inStream = inStream; data->layer = 0; memset(&(data->dither), 0, sizeof(struct audio_dither)); mad_stream_init(&data->stream); mad_stream_options(&data->stream, MAD_OPTION_IGNORECRC); mad_frame_init(&data->frame); mad_synth_init(&data->synth); mad_timer_reset(&data->timer); } static int seekMp3InputBuffer(mp3DecodeData * data, long offset) { if (seekInputStream(data->inStream, offset, SEEK_SET) < 0) { return -1; } mad_stream_buffer(&data->stream, data->readBuffer, 0); (data->stream).error = 0; return 0; } static int fillMp3InputBuffer(mp3DecodeData * data) { size_t readSize; size_t remaining; size_t readed; unsigned char *readStart; if ((data->stream).next_frame != NULL) { remaining = (data->stream).bufend - (data->stream).next_frame; memmove(data->readBuffer, (data->stream).next_frame, remaining); readStart = (data->readBuffer) + remaining; readSize = READ_BUFFER_SIZE - remaining; } else { readSize = READ_BUFFER_SIZE; readStart = data->readBuffer, remaining = 0; } /* we've exhausted the read buffer, so give up!, these potential * mp3 frames are way too big, and thus unlikely to be mp3 frames */ if (readSize == 0) return -1; readed = decoder_read(data->decoder, data->inStream, readStart, readSize); if (readed == 0) return -1; mad_stream_buffer(&data->stream, data->readBuffer, readed + remaining); (data->stream).error = 0; return 0; } #ifdef HAVE_ID3TAG static ReplayGainInfo *parseId3ReplayGainInfo(struct id3_tag *tag) { int i; char *key; char *value; struct id3_frame *frame; int found = 0; ReplayGainInfo *replayGainInfo; replayGainInfo = newReplayGainInfo(); for (i = 0; (frame = id3_tag_findframe(tag, "TXXX", i)); i++) { if (frame->nfields < 3) continue; key = (char *) id3_ucs4_latin1duplicate(id3_field_getstring (&frame->fields[1])); value = (char *) id3_ucs4_latin1duplicate(id3_field_getstring (&frame->fields[2])); if (strcasecmp(key, "replaygain_track_gain") == 0) { replayGainInfo->trackGain = atof(value); found = 1; } else if (strcasecmp(key, "replaygain_album_gain") == 0) { replayGainInfo->albumGain = atof(value); found = 1; } else if (strcasecmp(key, "replaygain_track_peak") == 0) { replayGainInfo->trackPeak = atof(value); found = 1; } else if (strcasecmp(key, "replaygain_album_peak") == 0) { replayGainInfo->albumPeak = atof(value); found = 1; } free(key); free(value); } if (found) return replayGainInfo; freeReplayGainInfo(replayGainInfo); return NULL; } #endif #ifdef HAVE_ID3TAG static void mp3_parseId3Tag(mp3DecodeData * data, size_t tagsize, struct tag ** mpdTag, ReplayGainInfo ** replayGainInfo) { struct id3_tag *id3Tag = NULL; id3_length_t count; id3_byte_t const *id3_data; id3_byte_t *allocated = NULL; struct tag *tmpMpdTag; ReplayGainInfo *tmpReplayGainInfo; count = data->stream.bufend - data->stream.this_frame; if (tagsize <= count) { id3_data = data->stream.this_frame; mad_stream_skip(&(data->stream), tagsize); } else { allocated = xmalloc(tagsize); if (!allocated) goto fail; memcpy(allocated, data->stream.this_frame, count); mad_stream_skip(&(data->stream), count); while (count < tagsize) { size_t len; len = decoder_read(data->decoder, data->inStream, allocated + count, tagsize - count); if (len == 0) break; else count += len; } if (count != tagsize) { DEBUG("mp3_decode: error parsing ID3 tag\n"); goto fail; } id3_data = allocated; } id3Tag = id3_tag_parse(id3_data, tagsize); if (!id3Tag) goto fail; if (mpdTag) { tmpMpdTag = tag_id3_import(id3Tag); if (tmpMpdTag) { if (*mpdTag) tag_free(*mpdTag); *mpdTag = tmpMpdTag; } } if (replayGainInfo) { tmpReplayGainInfo = parseId3ReplayGainInfo(id3Tag); if (tmpReplayGainInfo) { if (*replayGainInfo) freeReplayGainInfo(*replayGainInfo); *replayGainInfo = tmpReplayGainInfo; } } id3_tag_delete(id3Tag); fail: if (allocated) free(allocated); } #endif static enum mp3_action decodeNextFrameHeader(mp3DecodeData * data, struct tag ** tag, ReplayGainInfo ** replayGainInfo) { enum mad_layer layer; if ((data->stream).buffer == NULL || (data->stream).error == MAD_ERROR_BUFLEN) { if (fillMp3InputBuffer(data) < 0) { return DECODE_BREAK; } } if (mad_header_decode(&data->frame.header, &data->stream)) { #ifdef HAVE_ID3TAG if ((data->stream).error == MAD_ERROR_LOSTSYNC && (data->stream).this_frame) { signed long tagsize = id3_tag_query((data->stream). this_frame, (data->stream). bufend - (data->stream). this_frame); if (tagsize > 0) { if (tag && !(*tag)) { mp3_parseId3Tag(data, (size_t)tagsize, tag, replayGainInfo); } else { mad_stream_skip(&(data->stream), tagsize); } return DECODE_CONT; } } #endif if (MAD_RECOVERABLE((data->stream).error)) { return DECODE_SKIP; } else { if ((data->stream).error == MAD_ERROR_BUFLEN) return DECODE_CONT; else { ERROR("unrecoverable frame level error " "(%s).\n", mad_stream_errorstr(&data->stream)); return DECODE_BREAK; } } } layer = data->frame.header.layer; if (!data->layer) { if (layer != MAD_LAYER_II && layer != MAD_LAYER_III) { /* Only layer 2 and 3 have been tested to work */ return DECODE_SKIP; } data->layer = layer; } else if (layer != data->layer) { /* Don't decode frames with a different layer than the first */ return DECODE_SKIP; } return DECODE_OK; } static enum mp3_action decodeNextFrame(mp3DecodeData * data) { if ((data->stream).buffer == NULL || (data->stream).error == MAD_ERROR_BUFLEN) { if (fillMp3InputBuffer(data) < 0) { return DECODE_BREAK; } } if (mad_frame_decode(&data->frame, &data->stream)) { #ifdef HAVE_ID3TAG if ((data->stream).error == MAD_ERROR_LOSTSYNC) { signed long tagsize = id3_tag_query((data->stream). this_frame, (data->stream). bufend - (data->stream). this_frame); if (tagsize > 0) { mad_stream_skip(&(data->stream), tagsize); return DECODE_CONT; } } #endif if (MAD_RECOVERABLE((data->stream).error)) { return DECODE_SKIP; } else { if ((data->stream).error == MAD_ERROR_BUFLEN) return DECODE_CONT; else { ERROR("unrecoverable frame level error " "(%s).\n", mad_stream_errorstr(&data->stream)); return DECODE_BREAK; } } } return DECODE_OK; } /* xing stuff stolen from alsaplayer, and heavily modified by jat */ #define XI_MAGIC (('X' << 8) | 'i') #define NG_MAGIC (('n' << 8) | 'g') #define IN_MAGIC (('I' << 8) | 'n') #define FO_MAGIC (('f' << 8) | 'o') enum xing_magic { XING_MAGIC_XING, /* VBR */ XING_MAGIC_INFO /* CBR */ }; struct xing { long flags; /* valid fields (see below) */ unsigned long frames; /* total number of frames */ unsigned long bytes; /* total number of bytes */ unsigned char toc[100]; /* 100-point seek table */ long scale; /* VBR quality */ enum xing_magic magic; /* header magic */ }; enum { XING_FRAMES = 0x00000001L, XING_BYTES = 0x00000002L, XING_TOC = 0x00000004L, XING_SCALE = 0x00000008L }; struct version { unsigned major; unsigned minor; }; struct lame { char encoder[10]; /* 9 byte encoder name/version ("LAME3.97b") */ struct version version; /* struct containing just the version */ float peak; /* replaygain peak */ float trackGain; /* replaygain track gain */ float albumGain; /* replaygain album gain */ int encoderDelay; /* # of added samples at start of mp3 */ int encoderPadding; /* # of added samples at end of mp3 */ int crc; /* CRC of the first 190 bytes of this frame */ }; static int parse_xing(struct xing *xing, struct mad_bitptr *ptr, int *oldbitlen) { unsigned long bits; int bitlen; int bitsleft; int i; bitlen = *oldbitlen; if (bitlen < 16) goto fail; bits = mad_bit_read(ptr, 16); bitlen -= 16; if (bits == XI_MAGIC) { if (bitlen < 16) goto fail; if (mad_bit_read(ptr, 16) != NG_MAGIC) goto fail; bitlen -= 16; xing->magic = XING_MAGIC_XING; } else if (bits == IN_MAGIC) { if (bitlen < 16) goto fail; if (mad_bit_read(ptr, 16) != FO_MAGIC) goto fail; bitlen -= 16; xing->magic = XING_MAGIC_INFO; } else if (bits == NG_MAGIC) xing->magic = XING_MAGIC_XING; else if (bits == FO_MAGIC) xing->magic = XING_MAGIC_INFO; else goto fail; if (bitlen < 32) goto fail; xing->flags = mad_bit_read(ptr, 32); bitlen -= 32; if (xing->flags & XING_FRAMES) { if (bitlen < 32) goto fail; xing->frames = mad_bit_read(ptr, 32); bitlen -= 32; } if (xing->flags & XING_BYTES) { if (bitlen < 32) goto fail; xing->bytes = mad_bit_read(ptr, 32); bitlen -= 32; } if (xing->flags & XING_TOC) { if (bitlen < 800) goto fail; for (i = 0; i < 100; ++i) xing->toc[i] = mad_bit_read(ptr, 8); bitlen -= 800; } if (xing->flags & XING_SCALE) { if (bitlen < 32) goto fail; xing->scale = mad_bit_read(ptr, 32); bitlen -= 32; } /* Make sure we consume no less than 120 bytes (960 bits) in hopes that * the LAME tag is found there, and not right after the Xing header */ bitsleft = 960 - ((*oldbitlen) - bitlen); if (bitsleft < 0) goto fail; else if (bitsleft > 0) { mad_bit_read(ptr, bitsleft); bitlen -= bitsleft; } *oldbitlen = bitlen; return 1; fail: xing->flags = 0; return 0; } static int parse_lame(struct lame *lame, struct mad_bitptr *ptr, int *bitlen) { int adj = 0; int name; int orig; int sign; int gain; int i; /* Unlike the xing header, the lame tag has a fixed length. Fail if * not all 36 bytes (288 bits) are there. */ if (*bitlen < 288) return 0; for (i = 0; i < 9; i++) lame->encoder[i] = (char)mad_bit_read(ptr, 8); lame->encoder[9] = '\0'; *bitlen -= 72; /* This is technically incorrect, since the encoder might not be lame. * But there's no other way to determine if this is a lame tag, and we * wouldn't want to go reading a tag that's not there. */ if (prefixcmp(lame->encoder, "LAME")) return 0; if (sscanf(lame->encoder+4, "%u.%u", &lame->version.major, &lame->version.minor) != 2) return 0; DEBUG("detected LAME version %i.%i (\"%s\")\n", lame->version.major, lame->version.minor, lame->encoder); /* The reference volume was changed from the 83dB used in the * ReplayGain spec to 89dB in lame 3.95.1. Bump the gain for older * versions, since everyone else uses 89dB instead of 83dB. * Unfortunately, lame didn't differentiate between 3.95 and 3.95.1, so * it's impossible to make the proper adjustment for 3.95. * Fortunately, 3.95 was only out for about a day before 3.95.1 was * released. -- tmz */ if (lame->version.major < 3 || (lame->version.major == 3 && lame->version.minor < 95)) adj = 6; mad_bit_read(ptr, 16); lame->peak = mad_f_todouble(mad_bit_read(ptr, 32) << 5); /* peak */ DEBUG("LAME peak found: %f\n", lame->peak); lame->trackGain = 0; name = mad_bit_read(ptr, 3); /* gain name */ orig = mad_bit_read(ptr, 3); /* gain originator */ sign = mad_bit_read(ptr, 1); /* sign bit */ gain = mad_bit_read(ptr, 9); /* gain*10 */ if (gain && name == 1 && orig != 0) { lame->trackGain = ((sign ? -gain : gain) / 10.0) + adj; DEBUG("LAME track gain found: %f\n", lame->trackGain); } /* tmz reports that this isn't currently written by any version of lame * (as of 3.97). Since we have no way of testing it, don't use it. * Wouldn't want to go blowing someone's ears just because we read it * wrong. :P -- jat */ lame->albumGain = 0; #if 0 name = mad_bit_read(ptr, 3); /* gain name */ orig = mad_bit_read(ptr, 3); /* gain originator */ sign = mad_bit_read(ptr, 1); /* sign bit */ gain = mad_bit_read(ptr, 9); /* gain*10 */ if (gain && name == 2 && orig != 0) { lame->albumGain = ((sign ? -gain : gain) / 10.0) + adj; DEBUG("LAME album gain found: %f\n", lame->trackGain); } #else mad_bit_read(ptr, 16); #endif mad_bit_read(ptr, 16); lame->encoderDelay = mad_bit_read(ptr, 12); lame->encoderPadding = mad_bit_read(ptr, 12); DEBUG("encoder delay is %i, encoder padding is %i\n", lame->encoderDelay, lame->encoderPadding); mad_bit_read(ptr, 80); lame->crc = mad_bit_read(ptr, 16); *bitlen -= 216; return 1; } static int decodeFirstFrame(mp3DecodeData * data, struct tag ** tag, ReplayGainInfo ** replayGainInfo) { struct decoder *decoder = data->decoder; struct xing xing; struct lame lame; struct mad_bitptr ptr; int bitlen; int ret; /* stfu gcc */ memset(&xing, 0, sizeof(struct xing)); xing.flags = 0; while (1) { while ((ret = decodeNextFrameHeader(data, tag, replayGainInfo)) == DECODE_CONT && (!decoder || decoder_get_command(decoder) == DECODE_COMMAND_NONE)); if (ret == DECODE_BREAK || (decoder && decoder_get_command(decoder) != DECODE_COMMAND_NONE)) return -1; if (ret == DECODE_SKIP) continue; while ((ret = decodeNextFrame(data)) == DECODE_CONT && (!decoder || decoder_get_command(decoder) == DECODE_COMMAND_NONE)); if (ret == DECODE_BREAK || (decoder && decoder_get_command(decoder) != DECODE_COMMAND_NONE)) return -1; if (ret == DECODE_OK) break; } ptr = data->stream.anc_ptr; bitlen = data->stream.anc_bitlen; /* * Attempt to calulcate the length of the song from filesize */ { size_t offset = data->inStream->offset; mad_timer_t duration = data->frame.header.duration; float frameTime = ((float)mad_timer_count(duration, MAD_UNITS_MILLISECONDS)) / 1000; if (data->stream.this_frame != NULL) offset -= data->stream.bufend - data->stream.this_frame; else offset -= data->stream.bufend - data->stream.buffer; if (data->inStream->size >= offset) { data->totalTime = ((data->inStream->size - offset) * 8.0) / (data->frame).header.bitrate; data->maxFrames = data->totalTime / frameTime + FRAMES_CUSHION; } else { data->maxFrames = FRAMES_CUSHION; data->totalTime = 0; } } /* * if an xing tag exists, use that! */ if (parse_xing(&xing, &ptr, &bitlen)) { data->foundXing = 1; data->muteFrame = MUTEFRAME_SKIP; if ((xing.flags & XING_FRAMES) && xing.frames) { mad_timer_t duration = data->frame.header.duration; mad_timer_multiply(&duration, xing.frames); data->totalTime = ((float)mad_timer_count(duration, MAD_UNITS_MILLISECONDS)) / 1000; data->maxFrames = xing.frames; } if (parse_lame(&lame, &ptr, &bitlen)) { if (gaplessPlaybackEnabled && data->inStream->seekable) { data->dropSamplesAtStart = lame.encoderDelay + DECODERDELAY; data->dropSamplesAtEnd = lame.encoderPadding; } /* Album gain isn't currently used. See comment in * parse_lame() for details. -- jat */ if (replayGainInfo && !*replayGainInfo && lame.trackGain) { *replayGainInfo = newReplayGainInfo(); (*replayGainInfo)->trackGain = lame.trackGain; (*replayGainInfo)->trackPeak = lame.peak; } } } if (!data->maxFrames) return -1; if (data->maxFrames > 8 * 1024 * 1024) { ERROR("mp3 file header indicates too many frames: %lu", data->maxFrames); return -1; } data->frameOffset = xmalloc(sizeof(long) * data->maxFrames); data->times = xmalloc(sizeof(mad_timer_t) * data->maxFrames); return 0; } static void mp3DecodeDataFinalize(mp3DecodeData * data) { mad_synth_finish(&data->synth); mad_frame_finish(&data->frame); mad_stream_finish(&data->stream); if (data->frameOffset) free(data->frameOffset); if (data->times) free(data->times); } /* this is primarily used for getting total time for tags */ static int getMp3TotalTime(char *file) { InputStream inStream; mp3DecodeData data; int ret; if (openInputStream(&inStream, file) < 0) return -1; initMp3DecodeData(&data, NULL, &inStream); if (decodeFirstFrame(&data, NULL, NULL) < 0) ret = -1; else ret = data.totalTime + 0.5; mp3DecodeDataFinalize(&data); closeInputStream(&inStream); return ret; } static int openMp3FromInputStream(InputStream * inStream, mp3DecodeData * data, struct decoder * decoder, struct tag ** tag, ReplayGainInfo ** replayGainInfo) { initMp3DecodeData(data, decoder, inStream); *tag = NULL; if (decodeFirstFrame(data, tag, replayGainInfo) < 0) { mp3DecodeDataFinalize(data); if (tag && *tag) tag_free(*tag); return -1; } return 0; } static enum mp3_action mp3Read(mp3DecodeData * data, ReplayGainInfo ** replayGainInfo) { struct decoder *decoder = data->decoder; unsigned int pcm_length, max_samples; unsigned int i; int ret; int skip; if (data->currentFrame >= data->highestFrame) { mad_timer_add(&data->timer, (data->frame).header.duration); data->bitRate = (data->frame).header.bitrate; if (data->currentFrame >= data->maxFrames) { data->currentFrame = data->maxFrames - 1; } else { data->highestFrame++; } data->frameOffset[data->currentFrame] = data->inStream->offset; if (data->stream.this_frame != NULL) { data->frameOffset[data->currentFrame] -= data->stream.bufend - data->stream.this_frame; } else { data->frameOffset[data->currentFrame] -= data->stream.bufend - data->stream.buffer; } data->times[data->currentFrame] = data->timer; } else { data->timer = data->times[data->currentFrame]; } data->currentFrame++; data->elapsedTime = ((float)mad_timer_count(data->timer, MAD_UNITS_MILLISECONDS)) / 1000; switch (data->muteFrame) { case MUTEFRAME_SKIP: data->muteFrame = MUTEFRAME_NONE; break; case MUTEFRAME_SEEK: if (decoder_seek_where(decoder) <= data->elapsedTime) { decoder_clear(decoder); data->muteFrame = MUTEFRAME_NONE; decoder_command_finished(decoder); } break; case MUTEFRAME_NONE: mad_synth_frame(&data->synth, &data->frame); if (!data->foundFirstFrame) { unsigned int samplesPerFrame = (data->synth).pcm.length; data->dropFramesAtStart = data->dropSamplesAtStart / samplesPerFrame; data->dropFramesAtEnd = data->dropSamplesAtEnd / samplesPerFrame; data->dropSamplesAtStart = data->dropSamplesAtStart % samplesPerFrame; data->dropSamplesAtEnd = data->dropSamplesAtEnd % samplesPerFrame; data->foundFirstFrame = 1; } if (data->dropFramesAtStart > 0) { data->dropFramesAtStart--; break; } else if ((data->dropFramesAtEnd > 0) && (data->currentFrame == (data->maxFrames + 1 - data->dropFramesAtEnd))) { /* stop decoding, effectively dropping all remaining * frames */ return DECODE_BREAK; } if (data->inStream->metaTitle) { struct tag *tag = tag_new(); if (data->inStream->metaName) { tag_add_item(tag, TAG_ITEM_NAME, data->inStream->metaName); } tag_add_item(tag, TAG_ITEM_TITLE, data->inStream->metaTitle); free(data->inStream->metaTitle); data->inStream->metaTitle = NULL; tag_free(tag); } if (!data->decodedFirstFrame) { i = data->dropSamplesAtStart; data->decodedFirstFrame = 1; } else i = 0; pcm_length = data->synth.pcm.length; if (data->dropSamplesAtEnd && (data->currentFrame == data->maxFrames - data->dropFramesAtEnd)) { if (data->dropSamplesAtEnd >= pcm_length) pcm_length = 0; else pcm_length -= data->dropSamplesAtEnd; } max_samples = sizeof(data->outputBuffer) / (2 * MAD_NCHANNELS(&(data->frame).header)); while (i < pcm_length) { enum decoder_command cmd; unsigned int num_samples = pcm_length - i; if (num_samples > max_samples) num_samples = max_samples; i += num_samples; num_samples = dither_buffer(data->outputBuffer, &data->synth, &data->dither, i - num_samples, i, MAD_NCHANNELS(&(data->frame).header)); cmd = decoder_data(decoder, data->inStream, data->inStream->seekable, data->outputBuffer, 2 * num_samples, data->elapsedTime, data->bitRate / 1000, (replayGainInfo != NULL) ? *replayGainInfo : NULL); if (cmd == DECODE_COMMAND_STOP) return DECODE_BREAK; } if (data->dropSamplesAtEnd && (data->currentFrame == data->maxFrames - data->dropFramesAtEnd)) /* stop decoding, effectively dropping * all remaining samples */ return DECODE_BREAK; if (decoder_get_command(decoder) == DECODE_COMMAND_SEEK && data->inStream->seekable) { unsigned long j = 0; data->muteFrame = MUTEFRAME_SEEK; while (j < data->highestFrame && decoder_seek_where(decoder) > ((float)mad_timer_count(data->times[j], MAD_UNITS_MILLISECONDS)) / 1000) { j++; } if (j < data->highestFrame) { if (seekMp3InputBuffer(data, data->frameOffset[j]) == 0) { decoder_clear(decoder); data->currentFrame = j; decoder_command_finished(decoder); } else decoder_seek_error(decoder); data->muteFrame = MUTEFRAME_NONE; } } else if (decoder_get_command(decoder) == DECODE_COMMAND_SEEK && !data->inStream->seekable) { decoder_seek_error(decoder); } } while (1) { skip = 0; while ((ret = decodeNextFrameHeader(data, NULL, replayGainInfo)) == DECODE_CONT && decoder_get_command(decoder) == DECODE_COMMAND_NONE) ; if (ret == DECODE_BREAK || decoder_get_command(decoder) != DECODE_COMMAND_NONE) break; else if (ret == DECODE_SKIP) skip = 1; if (data->muteFrame == MUTEFRAME_NONE) { while ((ret = decodeNextFrame(data)) == DECODE_CONT && decoder_get_command(decoder) == DECODE_COMMAND_NONE) ; if (ret == DECODE_BREAK || decoder_get_command(decoder) != DECODE_COMMAND_NONE) break; } if (!skip && ret == DECODE_OK) break; } switch (decoder_get_command(decoder)) { case DECODE_COMMAND_NONE: case DECODE_COMMAND_START: break; case DECODE_COMMAND_STOP: return DECODE_BREAK; case DECODE_COMMAND_SEEK: return DECODE_CONT; } return ret; } static void initAudioFormatFromMp3DecodeData(mp3DecodeData * data, struct audio_format * af) { af->bits = 16; af->sampleRate = (data->frame).header.samplerate; af->channels = MAD_NCHANNELS(&(data->frame).header); } static int mp3_decode(struct decoder * decoder, InputStream * inStream) { mp3DecodeData data; struct tag *tag = NULL; ReplayGainInfo *replayGainInfo = NULL; struct audio_format audio_format; if (openMp3FromInputStream(inStream, &data, decoder, &tag, &replayGainInfo) < 0) { if (decoder_get_command(decoder) == DECODE_COMMAND_NONE) { ERROR ("Input does not appear to be a mp3 bit stream.\n"); return -1; } return 0; } initAudioFormatFromMp3DecodeData(&data, &audio_format); if (inStream->metaTitle) { if (tag) tag_free(tag); tag = tag_new(); tag_add_item(tag, TAG_ITEM_TITLE, inStream->metaTitle); free(inStream->metaTitle); inStream->metaTitle = NULL; if (inStream->metaName) { tag_add_item(tag, TAG_ITEM_NAME, inStream->metaName); } tag_free(tag); } else if (tag) { if (inStream->metaName) { tag_clear_items_by_type(tag, TAG_ITEM_NAME); tag_add_item(tag, TAG_ITEM_NAME, inStream->metaName); } tag_free(tag); } else if (inStream->metaName) { tag = tag_new(); if (inStream->metaName) { tag_add_item(tag, TAG_ITEM_NAME, inStream->metaName); } tag_free(tag); } decoder_initialized(decoder, &audio_format, data.totalTime); while (mp3Read(&data, &replayGainInfo) != DECODE_BREAK) ; if (replayGainInfo) freeReplayGainInfo(replayGainInfo); if (decoder_get_command(decoder) == DECODE_COMMAND_SEEK && data.muteFrame == MUTEFRAME_SEEK) { decoder_clear(decoder); decoder_command_finished(decoder); } decoder_flush(decoder); mp3DecodeDataFinalize(&data); return 0; } static struct tag *mp3_tagDup(char *file) { struct tag *ret = NULL; int total_time; ret = tag_id3_load(file); total_time = getMp3TotalTime(file); if (total_time >= 0) { if (!ret) ret = tag_new(); ret->time = total_time; } else { DEBUG("mp3_tagDup: Failed to get total song time from: %s\n", file); } return ret; } static const char *mp3_suffixes[] = { "mp3", "mp2", NULL }; static const char *mp3_mimeTypes[] = { "audio/mpeg", NULL }; struct decoder_plugin mp3Plugin = { .name = "mp3", .init = mp3_plugin_init, .stream_decode = mp3_decode, .tag_dup = mp3_tagDup, .stream_types = INPUT_PLUGIN_STREAM_FILE | INPUT_PLUGIN_STREAM_URL, .suffixes = mp3_suffixes, .mime_types = mp3_mimeTypes }; #else struct decoder_plugin mp3Plugin; #endif /* HAVE_MAD */