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-rw-r--r--trunk/src/inputPlugins/mp3_plugin.c1092
1 files changed, 1092 insertions, 0 deletions
diff --git a/trunk/src/inputPlugins/mp3_plugin.c b/trunk/src/inputPlugins/mp3_plugin.c
new file mode 100644
index 000000000..a920b98a1
--- /dev/null
+++ b/trunk/src/inputPlugins/mp3_plugin.c
@@ -0,0 +1,1092 @@
+/* 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 "../inputPlugin.h"
+
+#ifdef HAVE_MAD
+
+#include "../pcm_utils.h"
+#include <mad.h>
+
+#ifdef HAVE_ID3TAG
+#include <id3tag.h>
+#endif
+
+#include "../log.h"
+#include "../utils.h"
+#include "../replayGain.h"
+#include "../tag.h"
+#include "../conf.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+
+#define FRAMES_CUSHION 2000
+
+#define READ_BUFFER_SIZE 40960
+
+#define DECODE_SKIP -3
+#define DECODE_BREAK -2
+#define DECODE_CONT -1
+#define DECODE_OK 0
+
+#define MUTEFRAME_SKIP 1
+#define MUTEFRAME_SEEK 2
+
+/* the number of samples of silence the decoder inserts at start */
+#define DECODERDELAY 529
+
+#define DEFAULT_GAPLESS_MP3_PLAYBACK 1
+
+static int gaplessPlayback;
+
+/* 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 signed long audio_linear_dither(unsigned int bits, mad_fixed_t sample,
+ struct audio_dither *dither)
+{
+ unsigned int scalebits;
+ mad_fixed_t output, mask, random;
+
+ 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;
+
+ random = prng(dither->random);
+ output += (random & mask) - (dither->random & mask);
+
+ dither->random = random;
+
+ 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 output >> scalebits;
+}
+
+/* end of stolen stuff from mpg321 */
+
+static int mp3_plugin_init(void)
+{
+ gaplessPlayback = getBoolConfigParam(CONF_GAPLESS_MP3_PLAYBACK);
+ if (gaplessPlayback == -1) gaplessPlayback = DEFAULT_GAPLESS_MP3_PLAYBACK;
+ else if (gaplessPlayback < 0) exit(EXIT_FAILURE);
+ return 1;
+}
+
+/* decoder stuff is based on madlld */
+
+#define MP3_DATA_OUTPUT_BUFFER_SIZE 4096
+
+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];
+ char outputBuffer[MP3_DATA_OUTPUT_BUFFER_SIZE];
+ char *outputPtr;
+ char *outputBufferEnd;
+ float totalTime;
+ float elapsedTime;
+ int muteFrame;
+ long *frameOffset;
+ mad_timer_t *times;
+ long highestFrame;
+ long maxFrames;
+ long currentFrame;
+ int dropFramesAtStart;
+ int dropFramesAtEnd;
+ int dropSamplesAtStart;
+ int dropSamplesAtEnd;
+ int foundXing;
+ int foundFirstFrame;
+ int decodedFirstFrame;
+ int flush;
+ unsigned long bitRate;
+ InputStream *inStream;
+ struct audio_dither dither;
+ enum mad_layer layer;
+} mp3DecodeData;
+
+static void initMp3DecodeData(mp3DecodeData * data, InputStream * inStream)
+{
+ data->outputPtr = data->outputBuffer;
+ data->outputBufferEnd =
+ data->outputBuffer + MP3_DATA_OUTPUT_BUFFER_SIZE;
+ data->muteFrame = 0;
+ 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->flush = 1;
+ 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 = readFromInputStream(data->inStream, readStart, (size_t) 1,
+ readSize);
+ if (readed <= 0 && inputStreamAtEOF(data->inStream))
+ return -1;
+ /* sleep for a fraction of a second! */
+ else if (readed <= 0) {
+ readed = 0;
+ my_usleep(10000);
+ }
+
+ 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, signed long tagsize,
+ MpdTag ** mpdTag, ReplayGainInfo ** replayGainInfo)
+{
+ struct id3_tag *id3Tag = NULL;
+ id3_length_t count;
+ id3_byte_t const *id3_data;
+ id3_byte_t *allocated = NULL;
+ MpdTag *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) {
+ int len;
+
+ len = readFromInputStream(data->inStream,
+ allocated + count, (size_t) 1,
+ tagsize - count);
+ if (len <= 0 && inputStreamAtEOF(data->inStream)) {
+ break;
+ } else if (len <= 0)
+ my_usleep(10000);
+ 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 = parseId3Tag(id3Tag);
+ if (tmpMpdTag) {
+ if (*mpdTag)
+ freeMpdTag(*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 int decodeNextFrameHeader(mp3DecodeData * data, MpdTag ** 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, 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));
+ data->flush = 0;
+ 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 int 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));
+ data->flush = 0;
+ 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 lame {
+ char encoder[10]; /* 9 byte encoder name/version ("LAME3.97b") */
+#if 0
+ /* See related comment in parse_lame() */
+ float peak; /* replaygain peak */
+ float trackGain; /* replaygain track gain */
+ float albumGain; /* replaygain album gain */
+#endif
+ int encoderDelay; /* # of added samples at start of mp3 */
+ int encoderPadding; /* # of added samples at end of mp3 */
+};
+
+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 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';
+
+ /* 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 (strncmp(lame->encoder, "LAME", 4) != 0) return 0;
+
+#if 0
+ /* Apparently lame versions <3.97b1 do not calculate replaygain. I'm
+ * using lame 3.97b2, and while it does calculate replaygain, it's
+ * setting the values to 0. Using --replaygain-(fast|accurate) doesn't
+ * make any difference. Leaving this code unused until we have a way
+ * of testing it. -- jat */
+
+ mad_bit_read(ptr, 16);
+
+ mad_bit_read(ptr, 32); /* peak */
+
+ mad_bit_read(ptr, 6); /* header */
+ bits = mad_bit_read(ptr, 1); /* sign bit */
+ lame->trackGain = mad_bit_read(ptr, 9); /* gain*10 */
+ lame->trackGain = (bits ? -lame->trackGain : lame->trackGain) / 10;
+
+ mad_bit_read(ptr, 6); /* header */
+ bits = mad_bit_read(ptr, 1); /* sign bit */
+ lame->albumGain = mad_bit_read(ptr, 9); /* gain*10 */
+ lame->albumGain = (bits ? -lame->albumGain : lame->albumGain) / 10;
+
+ mad_bit_read(ptr, 16);
+#else
+ mad_bit_read(ptr, 96);
+#endif
+
+ lame->encoderDelay = mad_bit_read(ptr, 12);
+ lame->encoderPadding = mad_bit_read(ptr, 12);
+
+ mad_bit_read(ptr, 96);
+
+ *bitlen -= 288;
+
+ return 1;
+}
+
+static int decodeFirstFrame(mp3DecodeData * data, DecoderControl * dc,
+ MpdTag ** tag, ReplayGainInfo ** replayGainInfo)
+{
+ 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 &&
+ (!dc || !dc->stop));
+ if (ret == DECODE_BREAK || (dc && dc->stop)) return -1;
+ if (ret == DECODE_SKIP) continue;
+
+ while ((ret = decodeNextFrame(data)) == DECODE_CONT &&
+ (!dc || !dc->stop));
+ if (ret == DECODE_BREAK || (dc && dc->stop)) 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 (gaplessPlayback && data->inStream->seekable &&
+ parse_lame(&lame, &ptr, &bitlen)) {
+ data->dropSamplesAtStart = lame.encoderDelay + DECODERDELAY;
+ data->dropSamplesAtEnd = lame.encoderPadding;
+ }
+
+ 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 (!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, &inStream);
+ if (decodeFirstFrame(&data, NULL, NULL, NULL) < 0)
+ ret = -1;
+ else
+ ret = data.totalTime + 0.5;
+ mp3DecodeDataFinalize(&data);
+ closeInputStream(&inStream);
+
+ return ret;
+}
+
+static int openMp3FromInputStream(InputStream * inStream, mp3DecodeData * data,
+ DecoderControl * dc, MpdTag ** tag,
+ ReplayGainInfo ** replayGainInfo)
+{
+ initMp3DecodeData(data, inStream);
+ *tag = NULL;
+ if (decodeFirstFrame(data, dc, tag, replayGainInfo) < 0) {
+ mp3DecodeDataFinalize(data);
+ if (tag && *tag)
+ freeMpdTag(*tag);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int mp3Read(mp3DecodeData * data, OutputBuffer * cb, DecoderControl * dc,
+ ReplayGainInfo ** replayGainInfo)
+{
+ int samplesPerFrame;
+ int samplesLeft;
+ 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 = 0;
+ break;
+ case MUTEFRAME_SEEK:
+ if (dc->seekWhere <= data->elapsedTime) {
+ data->outputPtr = data->outputBuffer;
+ clearOutputBuffer(cb);
+ data->muteFrame = 0;
+ dc->seek = 0;
+ }
+ break;
+ default:
+ mad_synth_frame(&data->synth, &data->frame);
+
+ if (!data->foundFirstFrame) {
+ 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) {
+ MpdTag *tag = newMpdTag();
+ if (data->inStream->metaName) {
+ addItemToMpdTag(tag,
+ TAG_ITEM_NAME,
+ data->inStream->metaName);
+ }
+ addItemToMpdTag(tag, TAG_ITEM_TITLE,
+ data->inStream->metaTitle);
+ free(data->inStream->metaTitle);
+ data->inStream->metaTitle = NULL;
+ copyMpdTagToOutputBuffer(cb, tag);
+ freeMpdTag(tag);
+ }
+
+ samplesLeft = (data->synth).pcm.length;
+
+ for (i = 0; i < (data->synth).pcm.length; i++) {
+ mpd_sint16 *sample;
+
+ samplesLeft--;
+
+ if (!data->decodedFirstFrame &&
+ (i < data->dropSamplesAtStart)) {
+ continue;
+ } else if (data->dropSamplesAtEnd &&
+ (data->currentFrame == (data->maxFrames - data->dropFramesAtEnd)) &&
+ (samplesLeft < data->dropSamplesAtEnd)) {
+ /* stop decoding, effectively dropping
+ * all remaining samples */
+ return DECODE_BREAK;
+ }
+
+ sample = (mpd_sint16 *) data->outputPtr;
+ *sample = (mpd_sint16) audio_linear_dither(16,
+ (data->synth).pcm.samples[0][i],
+ &(data->dither));
+ data->outputPtr += 2;
+
+ if (MAD_NCHANNELS(&(data->frame).header) == 2) {
+ sample = (mpd_sint16 *) data->outputPtr;
+ *sample = (mpd_sint16) audio_linear_dither(16,
+ (data->synth).pcm.samples[1][i],
+ &(data->dither));
+ data->outputPtr += 2;
+ }
+
+ if (data->outputPtr >= data->outputBufferEnd) {
+ ret = sendDataToOutputBuffer(cb,
+ data->inStream,
+ dc,
+ data->inStream->seekable,
+ data->outputBuffer,
+ data->outputPtr - data->outputBuffer,
+ data->elapsedTime,
+ data->bitRate / 1000,
+ (replayGainInfo != NULL) ? *replayGainInfo : NULL);
+ if (ret == OUTPUT_BUFFER_DC_STOP) {
+ data->flush = 0;
+ return DECODE_BREAK;
+ }
+
+ data->outputPtr = data->outputBuffer;
+
+ if (ret == OUTPUT_BUFFER_DC_SEEK)
+ break;
+ }
+ }
+
+ data->decodedFirstFrame = 1;
+
+ if (dc->seek && data->inStream->seekable) {
+ long j = 0;
+ data->muteFrame = MUTEFRAME_SEEK;
+ while (j < data->highestFrame && dc->seekWhere >
+ ((float)mad_timer_count(data->times[j],
+ MAD_UNITS_MILLISECONDS))
+ / 1000) {
+ j++;
+ }
+ if (j < data->highestFrame) {
+ if (seekMp3InputBuffer(data,
+ data->frameOffset[j]) ==
+ 0) {
+ data->outputPtr = data->outputBuffer;
+ clearOutputBuffer(cb);
+ data->currentFrame = j;
+ } else
+ dc->seekError = 1;
+ data->muteFrame = 0;
+ dc->seek = 0;
+ }
+ } else if (dc->seek && !data->inStream->seekable) {
+ dc->seek = 0;
+ dc->seekError = 1;
+ }
+ }
+
+ while (1) {
+ skip = 0;
+ while ((ret =
+ decodeNextFrameHeader(data, NULL,
+ replayGainInfo)) == DECODE_CONT
+ && !dc->stop) ;
+ if (ret == DECODE_BREAK || dc->stop || dc->seek)
+ break;
+ else if (ret == DECODE_SKIP)
+ skip = 1;
+ if (!data->muteFrame) {
+ while ((ret = decodeNextFrame(data)) == DECODE_CONT &&
+ !dc->stop && !dc->seek) ;
+ if (ret == DECODE_BREAK || dc->stop || dc->seek)
+ break;
+ }
+ if (!skip && ret == DECODE_OK)
+ break;
+ }
+
+ if (dc->stop)
+ return DECODE_BREAK;
+
+ return ret;
+}
+
+static void initAudioFormatFromMp3DecodeData(mp3DecodeData * data,
+ AudioFormat * af)
+{
+ af->bits = 16;
+ af->sampleRate = (data->frame).header.samplerate;
+ af->channels = MAD_NCHANNELS(&(data->frame).header);
+}
+
+static int mp3_decode(OutputBuffer * cb, DecoderControl * dc,
+ InputStream * inStream)
+{
+ mp3DecodeData data;
+ MpdTag *tag = NULL;
+ ReplayGainInfo *replayGainInfo = NULL;
+
+ if (openMp3FromInputStream(inStream, &data, dc, &tag, &replayGainInfo) <
+ 0) {
+ closeInputStream(inStream);
+ if (!dc->stop) {
+ ERROR
+ ("Input does not appear to be a mp3 bit stream.\n");
+ return -1;
+ } else {
+ dc->state = DECODE_STATE_STOP;
+ dc->stop = 0;
+ }
+ return 0;
+ }
+
+ initAudioFormatFromMp3DecodeData(&data, &(dc->audioFormat));
+ getOutputAudioFormat(&(dc->audioFormat), &(cb->audioFormat));
+
+ dc->totalTime = data.totalTime;
+
+ if (inStream->metaTitle) {
+ if (tag)
+ freeMpdTag(tag);
+ tag = newMpdTag();
+ addItemToMpdTag(tag, TAG_ITEM_TITLE, inStream->metaTitle);
+ free(inStream->metaTitle);
+ inStream->metaTitle = NULL;
+ if (inStream->metaName) {
+ addItemToMpdTag(tag, TAG_ITEM_NAME, inStream->metaName);
+ }
+ copyMpdTagToOutputBuffer(cb, tag);
+ freeMpdTag(tag);
+ } else if (tag) {
+ if (inStream->metaName) {
+ clearItemsFromMpdTag(tag, TAG_ITEM_NAME);
+ addItemToMpdTag(tag, TAG_ITEM_NAME, inStream->metaName);
+ }
+ copyMpdTagToOutputBuffer(cb, tag);
+ freeMpdTag(tag);
+ } else if (inStream->metaName) {
+ tag = newMpdTag();
+ if (inStream->metaName) {
+ addItemToMpdTag(tag, TAG_ITEM_NAME, inStream->metaName);
+ }
+ copyMpdTagToOutputBuffer(cb, tag);
+ freeMpdTag(tag);
+ }
+
+ dc->state = DECODE_STATE_DECODE;
+
+ while (mp3Read(&data, cb, dc, &replayGainInfo) != DECODE_BREAK) ;
+ /* send last little bit if not dc->stop */
+ if (!dc->stop && data.outputPtr != data.outputBuffer && data.flush) {
+ sendDataToOutputBuffer(cb, NULL, dc,
+ data.inStream->seekable,
+ data.outputBuffer,
+ data.outputPtr - data.outputBuffer,
+ data.elapsedTime, data.bitRate / 1000,
+ replayGainInfo);
+ }
+
+ if (replayGainInfo)
+ freeReplayGainInfo(replayGainInfo);
+
+ closeInputStream(inStream);
+
+ if (dc->seek && data.muteFrame == MUTEFRAME_SEEK) {
+ clearOutputBuffer(cb);
+ dc->seek = 0;
+ }
+
+ flushOutputBuffer(cb);
+ mp3DecodeDataFinalize(&data);
+
+ if (dc->stop) {
+ dc->state = DECODE_STATE_STOP;
+ dc->stop = 0;
+ } else
+ dc->state = DECODE_STATE_STOP;
+
+ return 0;
+}
+
+static MpdTag *mp3_tagDup(char *file)
+{
+ MpdTag *ret = NULL;
+ int time;
+
+ ret = id3Dup(file);
+
+ time = getMp3TotalTime(file);
+
+ if (time >= 0) {
+ if (!ret)
+ ret = newMpdTag();
+ ret->time = time;
+ } else {
+ DEBUG("mp3_tagDup: Failed to get total song time from: %s\n",
+ file);
+ }
+
+ return ret;
+}
+
+static char *mp3_suffixes[] = { "mp3", "mp2", NULL };
+static char *mp3_mimeTypes[] = { "audio/mpeg", NULL };
+
+InputPlugin mp3Plugin = {
+ "mp3",
+ mp3_plugin_init,
+ NULL,
+ NULL,
+ mp3_decode,
+ NULL,
+ mp3_tagDup,
+ INPUT_PLUGIN_STREAM_FILE | INPUT_PLUGIN_STREAM_URL,
+ mp3_suffixes,
+ mp3_mimeTypes
+};
+#else
+
+InputPlugin mp3Plugin;
+
+#endif /* HAVE_MAD */
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-03 14:41:25 +0000