diff options
Diffstat (limited to 'src/decoder/mp3_plugin.c')
| -rw-r--r-- | src/decoder/mp3_plugin.c | 1086 |
1 files changed, 1086 insertions, 0 deletions
diff --git a/src/decoder/mp3_plugin.c b/src/decoder/mp3_plugin.c new file mode 100644 index 000000000..a0de30ba7 --- /dev/null +++ b/src/decoder/mp3_plugin.c @@ -0,0 +1,1086 @@ +/* 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" +#include "../log.h" +#include "../utils.h" +#include "../conf.h" + +#include <mad.h> + +#ifdef HAVE_ID3TAG +#include <id3tag.h> +#endif + +#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; + +static inline int32_t +mad_fixed_to_24_sample(mad_fixed_t sample) +{ + enum { + bits = 24, + MIN = -MAD_F_ONE, + MAX = MAD_F_ONE - 1 + }; + + /* round */ + sample = sample + (1L << (MAD_F_FRACBITS - bits)); + + /* clip */ + if (sample > MAX) + sample = MAX; + else if (sample < MIN) + sample = MIN; + + /* quantize */ + return sample >> (MAD_F_FRACBITS + 1 - bits); +} + +static void +mad_fixed_to_24_buffer(int32_t *dest, const struct mad_synth *synth, + unsigned int start, unsigned int end, + unsigned int num_channels) +{ + unsigned int i, c; + + for (i = start; i < end; ++i) { + for (c = 0; c < num_channels; ++c) + *dest++ = mad_fixed_to_24_sample(synth->pcm.samples[c][i]); + } +} + +/* 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]; + int32_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; + 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; + + 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) / + sizeof(data->outputBuffer[0]) / + 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; + + mad_fixed_to_24_buffer(data->outputBuffer, + &data->synth, + i - num_samples, i, + MAD_NCHANNELS(&(data->frame).header)); + num_samples *= MAD_NCHANNELS(&(data->frame).header); + + cmd = decoder_data(decoder, data->inStream, + data->inStream->seekable, + data->outputBuffer, + sizeof(data->outputBuffer[0]) * 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 = 24; + af->sample_rate = (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 +}; 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