aboutsummaryrefslogtreecommitdiffstats
path: root/src/decoder/MadDecoderPlugin.cxx
diff options
context:
space:
mode:
Diffstat (limited to 'src/decoder/MadDecoderPlugin.cxx')
-rw-r--r--src/decoder/MadDecoderPlugin.cxx1178
1 files changed, 0 insertions, 1178 deletions
diff --git a/src/decoder/MadDecoderPlugin.cxx b/src/decoder/MadDecoderPlugin.cxx
deleted file mode 100644
index 9dd86c55f..000000000
--- a/src/decoder/MadDecoderPlugin.cxx
+++ /dev/null
@@ -1,1178 +0,0 @@
-/*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
- * 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.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#include "config.h"
-#include "MadDecoderPlugin.hxx"
-#include "DecoderAPI.hxx"
-#include "InputStream.hxx"
-#include "ConfigGlobal.hxx"
-#include "tag/TagId3.hxx"
-#include "tag/TagRva2.hxx"
-#include "tag/TagHandler.hxx"
-#include "CheckAudioFormat.hxx"
-#include "util/ASCII.hxx"
-#include "util/Error.hxx"
-#include "util/Domain.hxx"
-#include "Log.hxx"
-
-#include <assert.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <glib.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 true
-
-static constexpr Domain mad_domain("mad");
-
-static bool gapless_playback;
-
-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 (gcc_unlikely(sample > MAX))
- sample = MAX;
- else if (gcc_unlikely(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]);
- }
-}
-
-static bool
-mp3_plugin_init(gcc_unused const config_param &param)
-{
- gapless_playback = config_get_bool(CONF_GAPLESS_MP3_PLAYBACK,
- DEFAULT_GAPLESS_MP3_PLAYBACK);
- return true;
-}
-
-#define MP3_DATA_OUTPUT_BUFFER_SIZE 2048
-
-struct MadDecoder {
- struct mad_stream stream;
- struct mad_frame frame;
- struct mad_synth synth;
- mad_timer_t timer;
- unsigned char input_buffer[READ_BUFFER_SIZE];
- int32_t output_buffer[MP3_DATA_OUTPUT_BUFFER_SIZE];
- float total_time;
- float elapsed_time;
- float seek_where;
- enum muteframe mute_frame;
- long *frame_offsets;
- mad_timer_t *times;
- unsigned long highest_frame;
- unsigned long max_frames;
- unsigned long current_frame;
- unsigned int drop_start_frames;
- unsigned int drop_end_frames;
- unsigned int drop_start_samples;
- unsigned int drop_end_samples;
- bool found_replay_gain;
- bool found_xing;
- bool found_first_frame;
- bool decoded_first_frame;
- unsigned long bit_rate;
- Decoder *const decoder;
- InputStream &input_stream;
- enum mad_layer layer;
-
- MadDecoder(Decoder *decoder, InputStream &input_stream);
- ~MadDecoder();
-
- bool Seek(long offset);
- bool FillBuffer();
- void ParseId3(size_t tagsize, Tag **mpd_tag);
- enum mp3_action DecodeNextFrameHeader(Tag **tag);
- enum mp3_action DecodeNextFrame();
-
- gcc_pure
- InputStream::offset_type ThisFrameOffset() const;
-
- gcc_pure
- InputStream::offset_type RestIncludingThisFrame() const;
-
- /**
- * Attempt to calulcate the length of the song from filesize
- */
- void FileSizeToSongLength();
-
- bool DecodeFirstFrame(Tag **tag);
-
- gcc_pure
- long TimeToFrame(double t) const;
-
- void UpdateTimerNextFrame();
-
- /**
- * Sends the synthesized current frame via decoder_data().
- */
- DecoderCommand SendPCM(unsigned i, unsigned pcm_length);
-
- /**
- * Synthesize the current frame and send it via
- * decoder_data().
- */
- DecoderCommand SyncAndSend();
-
- bool Read();
-};
-
-MadDecoder::MadDecoder(Decoder *_decoder,
- InputStream &_input_stream)
- :mute_frame(MUTEFRAME_NONE),
- frame_offsets(nullptr),
- times(nullptr),
- highest_frame(0), max_frames(0), current_frame(0),
- drop_start_frames(0), drop_end_frames(0),
- drop_start_samples(0), drop_end_samples(0),
- found_replay_gain(false), found_xing(false),
- found_first_frame(false), decoded_first_frame(false),
- decoder(_decoder), input_stream(_input_stream),
- layer(mad_layer(0))
-{
- mad_stream_init(&stream);
- mad_stream_options(&stream, MAD_OPTION_IGNORECRC);
- mad_frame_init(&frame);
- mad_synth_init(&synth);
- mad_timer_reset(&timer);
-}
-
-inline bool
-MadDecoder::Seek(long offset)
-{
- Error error;
- if (!input_stream.LockSeek(offset, SEEK_SET, error))
- return false;
-
- mad_stream_buffer(&stream, input_buffer, 0);
- stream.error = MAD_ERROR_NONE;
-
- return true;
-}
-
-inline bool
-MadDecoder::FillBuffer()
-{
- size_t remaining, length;
- unsigned char *dest;
-
- if (stream.next_frame != nullptr) {
- remaining = stream.bufend - stream.next_frame;
- memmove(input_buffer, stream.next_frame, remaining);
- dest = input_buffer + remaining;
- length = READ_BUFFER_SIZE - remaining;
- } else {
- remaining = 0;
- length = READ_BUFFER_SIZE;
- dest = input_buffer;
- }
-
- /* 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 (length == 0)
- return false;
-
- length = decoder_read(decoder, input_stream, dest, length);
- if (length == 0)
- return false;
-
- mad_stream_buffer(&stream, input_buffer, length + remaining);
- stream.error = MAD_ERROR_NONE;
-
- return true;
-}
-
-#ifdef HAVE_ID3TAG
-static bool
-parse_id3_replay_gain_info(ReplayGainInfo &rgi,
- struct id3_tag *tag)
-{
- int i;
- char *key;
- char *value;
- struct id3_frame *frame;
- bool found = false;
-
- rgi.Clear();
-
- 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 (StringEqualsCaseASCII(key, "replaygain_track_gain")) {
- rgi.tuples[REPLAY_GAIN_TRACK].gain = atof(value);
- found = true;
- } else if (StringEqualsCaseASCII(key, "replaygain_album_gain")) {
- rgi.tuples[REPLAY_GAIN_ALBUM].gain = atof(value);
- found = true;
- } else if (StringEqualsCaseASCII(key, "replaygain_track_peak")) {
- rgi.tuples[REPLAY_GAIN_TRACK].peak = atof(value);
- found = true;
- } else if (StringEqualsCaseASCII(key, "replaygain_album_peak")) {
- rgi.tuples[REPLAY_GAIN_ALBUM].peak = atof(value);
- found = true;
- }
-
- free(key);
- free(value);
- }
-
- return found ||
- /* fall back on RVA2 if no replaygain tags found */
- tag_rva2_parse(tag, rgi);
-}
-#endif
-
-#ifdef HAVE_ID3TAG
-gcc_pure
-static MixRampInfo
-parse_id3_mixramp(struct id3_tag *tag)
-{
- int i;
- char *key;
- char *value;
- struct id3_frame *frame;
-
- MixRampInfo result;
-
- 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 (StringEqualsCaseASCII(key, "mixramp_start")) {
- result.SetStart(value);
- } else if (StringEqualsCaseASCII(key, "mixramp_end")) {
- result.SetEnd(value);
- }
-
- free(key);
- free(value);
- }
-
- return result;
-}
-#endif
-
-inline void
-MadDecoder::ParseId3(size_t tagsize, Tag **mpd_tag)
-{
-#ifdef HAVE_ID3TAG
- struct id3_tag *id3_tag = nullptr;
- id3_length_t count;
- id3_byte_t const *id3_data;
- id3_byte_t *allocated = nullptr;
-
- count = stream.bufend - stream.this_frame;
-
- if (tagsize <= count) {
- id3_data = stream.this_frame;
- mad_stream_skip(&(stream), tagsize);
- } else {
- allocated = (id3_byte_t *)g_malloc(tagsize);
- memcpy(allocated, stream.this_frame, count);
- mad_stream_skip(&(stream), count);
-
- while (count < tagsize) {
- size_t len;
-
- len = decoder_read(decoder, input_stream,
- allocated + count, tagsize - count);
- if (len == 0)
- break;
- else
- count += len;
- }
-
- if (count != tagsize) {
- LogDebug(mad_domain, "error parsing ID3 tag");
- g_free(allocated);
- return;
- }
-
- id3_data = allocated;
- }
-
- id3_tag = id3_tag_parse(id3_data, tagsize);
- if (id3_tag == nullptr) {
- g_free(allocated);
- return;
- }
-
- if (mpd_tag) {
- Tag *tmp_tag = tag_id3_import(id3_tag);
- if (tmp_tag != nullptr) {
- delete *mpd_tag;
- *mpd_tag = tmp_tag;
- }
- }
-
- if (decoder != nullptr) {
- ReplayGainInfo rgi;
-
- if (parse_id3_replay_gain_info(rgi, id3_tag)) {
- decoder_replay_gain(*decoder, &rgi);
- found_replay_gain = true;
- }
-
- decoder_mixramp(*decoder, parse_id3_mixramp(id3_tag));
- }
-
- id3_tag_delete(id3_tag);
-
- g_free(allocated);
-#else /* !HAVE_ID3TAG */
- (void)mpd_tag;
-
- /* This code is enabled when libid3tag is disabled. Instead
- of parsing the ID3 frame, it just skips it. */
-
- size_t count = stream.bufend - stream.this_frame;
-
- if (tagsize <= count) {
- mad_stream_skip(&stream, tagsize);
- } else {
- mad_stream_skip(&stream, count);
-
- while (count < tagsize) {
- size_t len = tagsize - count;
- char ignored[1024];
- if (len > sizeof(ignored))
- len = sizeof(ignored);
-
- len = decoder_read(decoder, input_stream,
- ignored, len);
- if (len == 0)
- break;
- else
- count += len;
- }
- }
-#endif
-}
-
-#ifndef HAVE_ID3TAG
-/**
- * This function emulates libid3tag when it is disabled. Instead of
- * doing a real analyzation of the frame, it just checks whether the
- * frame begins with the string "ID3". If so, it returns the length
- * of the ID3 frame.
- */
-static signed long
-id3_tag_query(const void *p0, size_t length)
-{
- const char *p = (const char *)p0;
-
- return length >= 10 && memcmp(p, "ID3", 3) == 0
- ? (p[8] << 7) + p[9] + 10
- : 0;
-}
-#endif /* !HAVE_ID3TAG */
-
-enum mp3_action
-MadDecoder::DecodeNextFrameHeader(Tag **tag)
-{
- if ((stream.buffer == nullptr || stream.error == MAD_ERROR_BUFLEN) &&
- !FillBuffer())
- return DECODE_BREAK;
-
- if (mad_header_decode(&frame.header, &stream)) {
- if (stream.error == MAD_ERROR_LOSTSYNC && stream.this_frame) {
- signed long tagsize = id3_tag_query(stream.this_frame,
- stream.bufend -
- stream.this_frame);
-
- if (tagsize > 0) {
- if (tag && !(*tag)) {
- ParseId3((size_t)tagsize, tag);
- } else {
- mad_stream_skip(&stream, tagsize);
- }
- return DECODE_CONT;
- }
- }
- if (MAD_RECOVERABLE(stream.error)) {
- return DECODE_SKIP;
- } else {
- if (stream.error == MAD_ERROR_BUFLEN)
- return DECODE_CONT;
- else {
- FormatWarning(mad_domain,
- "unrecoverable frame level error: %s",
- mad_stream_errorstr(&stream));
- return DECODE_BREAK;
- }
- }
- }
-
- enum mad_layer new_layer = frame.header.layer;
- if (layer == (mad_layer)0) {
- if (new_layer != MAD_LAYER_II && new_layer != MAD_LAYER_III) {
- /* Only layer 2 and 3 have been tested to work */
- return DECODE_SKIP;
- }
-
- layer = new_layer;
- } else if (new_layer != layer) {
- /* Don't decode frames with a different layer than the first */
- return DECODE_SKIP;
- }
-
- return DECODE_OK;
-}
-
-enum mp3_action
-MadDecoder::DecodeNextFrame()
-{
- if ((stream.buffer == nullptr || stream.error == MAD_ERROR_BUFLEN) &&
- !FillBuffer())
- return DECODE_BREAK;
-
- if (mad_frame_decode(&frame, &stream)) {
- if (stream.error == MAD_ERROR_LOSTSYNC) {
- signed long tagsize = id3_tag_query(stream.this_frame,
- stream.bufend -
- stream.this_frame);
- if (tagsize > 0) {
- mad_stream_skip(&stream, tagsize);
- return DECODE_CONT;
- }
- }
- if (MAD_RECOVERABLE(stream.error)) {
- return DECODE_SKIP;
- } else {
- if (stream.error == MAD_ERROR_BUFLEN)
- return DECODE_CONT;
- else {
- FormatWarning(mad_domain,
- "unrecoverable frame level error: %s",
- mad_stream_errorstr(&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 lame_version {
- unsigned major;
- unsigned minor;
-};
-
-struct lame {
- char encoder[10]; /* 9 byte encoder name/version ("LAME3.97b") */
- struct lame_version version; /* struct containing just the version */
- float peak; /* replaygain peak */
- float track_gain; /* replaygain track gain */
- float album_gain; /* replaygain album gain */
- int encoder_delay; /* # of added samples at start of mp3 */
- int encoder_padding; /* # of added samples at end of mp3 */
- int crc; /* CRC of the first 190 bytes of this frame */
-};
-
-static bool
-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)
- return false;
-
- bits = mad_bit_read(ptr, 16);
- bitlen -= 16;
-
- if (bits == XI_MAGIC) {
- if (bitlen < 16)
- return false;
-
- if (mad_bit_read(ptr, 16) != NG_MAGIC)
- return false;
-
- bitlen -= 16;
- xing->magic = XING_MAGIC_XING;
- } else if (bits == IN_MAGIC) {
- if (bitlen < 16)
- return false;
-
- if (mad_bit_read(ptr, 16) != FO_MAGIC)
- return false;
-
- 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
- return false;
-
- if (bitlen < 32)
- return false;
- xing->flags = mad_bit_read(ptr, 32);
- bitlen -= 32;
-
- if (xing->flags & XING_FRAMES) {
- if (bitlen < 32)
- return false;
- xing->frames = mad_bit_read(ptr, 32);
- bitlen -= 32;
- }
-
- if (xing->flags & XING_BYTES) {
- if (bitlen < 32)
- return false;
- xing->bytes = mad_bit_read(ptr, 32);
- bitlen -= 32;
- }
-
- if (xing->flags & XING_TOC) {
- if (bitlen < 800)
- return false;
- for (i = 0; i < 100; ++i) xing->toc[i] = mad_bit_read(ptr, 8);
- bitlen -= 800;
- }
-
- if (xing->flags & XING_SCALE) {
- if (bitlen < 32)
- return false;
- 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)
- return false;
- else if (bitsleft > 0) {
- mad_bit_read(ptr, bitsleft);
- bitlen -= bitsleft;
- }
-
- *oldbitlen = bitlen;
-
- return true;
-}
-
-static bool
-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 false;
-
- 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 (!g_str_has_prefix(lame->encoder, "LAME"))
- return false;
-
- if (sscanf(lame->encoder+4, "%u.%u",
- &lame->version.major, &lame->version.minor) != 2)
- return false;
-
- FormatDebug(mad_domain, "detected LAME version %i.%i (\"%s\")",
- 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 */
- FormatDebug(mad_domain, "LAME peak found: %f", lame->peak);
-
- lame->track_gain = 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->track_gain = ((sign ? -gain : gain) / 10.0) + adj;
- FormatDebug(mad_domain, "LAME track gain found: %f",
- lame->track_gain);
- }
-
- /* 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->album_gain = 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->album_gain = ((sign ? -gain : gain) / 10.0) + adj;
- FormatDebug(mad_domain, "LAME album gain found: %f",
- lame->track_gain);
- }
-#else
- mad_bit_read(ptr, 16);
-#endif
-
- mad_bit_read(ptr, 16);
-
- lame->encoder_delay = mad_bit_read(ptr, 12);
- lame->encoder_padding = mad_bit_read(ptr, 12);
-
- FormatDebug(mad_domain, "encoder delay is %i, encoder padding is %i",
- lame->encoder_delay, lame->encoder_padding);
-
- mad_bit_read(ptr, 80);
-
- lame->crc = mad_bit_read(ptr, 16);
-
- *bitlen -= 216;
-
- return true;
-}
-
-static inline float
-mp3_frame_duration(const struct mad_frame *frame)
-{
- return mad_timer_count(frame->header.duration,
- MAD_UNITS_MILLISECONDS) / 1000.0;
-}
-
-inline InputStream::offset_type
-MadDecoder::ThisFrameOffset() const
-{
- auto offset = input_stream.GetOffset();
-
- if (stream.this_frame != nullptr)
- offset -= stream.bufend - stream.this_frame;
- else
- offset -= stream.bufend - stream.buffer;
-
- return offset;
-}
-
-inline InputStream::offset_type
-MadDecoder::RestIncludingThisFrame() const
-{
- return input_stream.GetSize() - ThisFrameOffset();
-}
-
-inline void
-MadDecoder::FileSizeToSongLength()
-{
- InputStream::offset_type rest = RestIncludingThisFrame();
-
- if (rest > 0) {
- float frame_duration = mp3_frame_duration(&frame);
-
- total_time = (rest * 8.0) / frame.header.bitrate;
- max_frames = total_time / frame_duration + FRAMES_CUSHION;
- } else {
- max_frames = FRAMES_CUSHION;
- total_time = 0;
- }
-}
-
-inline bool
-MadDecoder::DecodeFirstFrame(Tag **tag)
-{
- struct xing xing;
- struct lame lame;
- struct mad_bitptr ptr;
- int bitlen;
- enum mp3_action ret;
-
- /* stfu gcc */
- memset(&xing, 0, sizeof(struct xing));
- xing.flags = 0;
-
- while (true) {
- do {
- ret = DecodeNextFrameHeader(tag);
- } while (ret == DECODE_CONT);
- if (ret == DECODE_BREAK)
- return false;
- if (ret == DECODE_SKIP) continue;
-
- do {
- ret = DecodeNextFrame();
- } while (ret == DECODE_CONT);
- if (ret == DECODE_BREAK)
- return false;
- if (ret == DECODE_OK) break;
- }
-
- ptr = stream.anc_ptr;
- bitlen = stream.anc_bitlen;
-
- FileSizeToSongLength();
-
- /*
- * if an xing tag exists, use that!
- */
- if (parse_xing(&xing, &ptr, &bitlen)) {
- found_xing = true;
- mute_frame = MUTEFRAME_SKIP;
-
- if ((xing.flags & XING_FRAMES) && xing.frames) {
- mad_timer_t duration = frame.header.duration;
- mad_timer_multiply(&duration, xing.frames);
- total_time = ((float)mad_timer_count(duration, MAD_UNITS_MILLISECONDS)) / 1000;
- max_frames = xing.frames;
- }
-
- if (parse_lame(&lame, &ptr, &bitlen)) {
- if (gapless_playback && input_stream.IsSeekable()) {
- drop_start_samples = lame.encoder_delay +
- DECODERDELAY;
- drop_end_samples = lame.encoder_padding;
- }
-
- /* Album gain isn't currently used. See comment in
- * parse_lame() for details. -- jat */
- if (decoder != nullptr && !found_replay_gain &&
- lame.track_gain) {
- ReplayGainInfo rgi;
- rgi.Clear();
- rgi.tuples[REPLAY_GAIN_TRACK].gain = lame.track_gain;
- rgi.tuples[REPLAY_GAIN_TRACK].peak = lame.peak;
- decoder_replay_gain(*decoder, &rgi);
- }
- }
- }
-
- if (!max_frames)
- return false;
-
- if (max_frames > 8 * 1024 * 1024) {
- FormatWarning(mad_domain,
- "mp3 file header indicates too many frames: %lu",
- max_frames);
- return false;
- }
-
- frame_offsets = new long[max_frames];
- times = new mad_timer_t[max_frames];
-
- return true;
-}
-
-MadDecoder::~MadDecoder()
-{
- mad_synth_finish(&synth);
- mad_frame_finish(&frame);
- mad_stream_finish(&stream);
-
- delete[] frame_offsets;
- delete[] times;
-}
-
-/* this is primarily used for getting total time for tags */
-static int
-mad_decoder_total_file_time(InputStream &is)
-{
- MadDecoder data(nullptr, is);
- return data.DecodeFirstFrame(nullptr)
- ? data.total_time + 0.5
- : -1;
-}
-
-long
-MadDecoder::TimeToFrame(double t) const
-{
- unsigned long i;
-
- for (i = 0; i < highest_frame; ++i) {
- double frame_time =
- mad_timer_count(times[i],
- MAD_UNITS_MILLISECONDS) / 1000.;
- if (frame_time >= t)
- break;
- }
-
- return i;
-}
-
-void
-MadDecoder::UpdateTimerNextFrame()
-{
- if (current_frame >= highest_frame) {
- /* record this frame's properties in frame_offsets
- (for seeking) and times */
- bit_rate = frame.header.bitrate;
-
- if (current_frame >= max_frames)
- /* cap current_frame */
- current_frame = max_frames - 1;
- else
- highest_frame++;
-
- frame_offsets[current_frame] = ThisFrameOffset();
-
- mad_timer_add(&timer, frame.header.duration);
- times[current_frame] = timer;
- } else
- /* get the new timer value from "times" */
- timer = times[current_frame];
-
- current_frame++;
- elapsed_time = mad_timer_count(timer, MAD_UNITS_MILLISECONDS) / 1000.0;
-}
-
-DecoderCommand
-MadDecoder::SendPCM(unsigned i, unsigned pcm_length)
-{
- unsigned max_samples;
-
- max_samples = sizeof(output_buffer) /
- sizeof(output_buffer[0]) /
- MAD_NCHANNELS(&frame.header);
-
- while (i < pcm_length) {
- unsigned int num_samples = pcm_length - i;
- if (num_samples > max_samples)
- num_samples = max_samples;
-
- i += num_samples;
-
- mad_fixed_to_24_buffer(output_buffer, &synth,
- i - num_samples, i,
- MAD_NCHANNELS(&frame.header));
- num_samples *= MAD_NCHANNELS(&frame.header);
-
- auto cmd = decoder_data(*decoder, input_stream, output_buffer,
- sizeof(output_buffer[0]) * num_samples,
- bit_rate / 1000);
- if (cmd != DecoderCommand::NONE)
- return cmd;
- }
-
- return DecoderCommand::NONE;
-}
-
-inline DecoderCommand
-MadDecoder::SyncAndSend()
-{
- mad_synth_frame(&synth, &frame);
-
- if (!found_first_frame) {
- unsigned int samples_per_frame = synth.pcm.length;
- drop_start_frames = drop_start_samples / samples_per_frame;
- drop_end_frames = drop_end_samples / samples_per_frame;
- drop_start_samples = drop_start_samples % samples_per_frame;
- drop_end_samples = drop_end_samples % samples_per_frame;
- found_first_frame = true;
- }
-
- if (drop_start_frames > 0) {
- drop_start_frames--;
- return DecoderCommand::NONE;
- } else if ((drop_end_frames > 0) &&
- (current_frame == (max_frames + 1 - drop_end_frames))) {
- /* stop decoding, effectively dropping all remaining
- frames */
- return DecoderCommand::STOP;
- }
-
- unsigned i = 0;
- if (!decoded_first_frame) {
- i = drop_start_samples;
- decoded_first_frame = true;
- }
-
- unsigned pcm_length = synth.pcm.length;
- if (drop_end_samples &&
- (current_frame == max_frames - drop_end_frames)) {
- if (drop_end_samples >= pcm_length)
- pcm_length = 0;
- else
- pcm_length -= drop_end_samples;
- }
-
- auto cmd = SendPCM(i, pcm_length);
- if (cmd != DecoderCommand::NONE)
- return cmd;
-
- if (drop_end_samples &&
- (current_frame == max_frames - drop_end_frames))
- /* stop decoding, effectively dropping
- * all remaining samples */
- return DecoderCommand::STOP;
-
- return DecoderCommand::NONE;
-}
-
-inline bool
-MadDecoder::Read()
-{
- enum mp3_action ret;
-
- UpdateTimerNextFrame();
-
- switch (mute_frame) {
- DecoderCommand cmd;
-
- case MUTEFRAME_SKIP:
- mute_frame = MUTEFRAME_NONE;
- break;
- case MUTEFRAME_SEEK:
- if (elapsed_time >= seek_where)
- mute_frame = MUTEFRAME_NONE;
- break;
- case MUTEFRAME_NONE:
- cmd = SyncAndSend();
- if (cmd == DecoderCommand::SEEK) {
- unsigned long j;
-
- assert(input_stream.IsSeekable());
-
- j = TimeToFrame(decoder_seek_where(*decoder));
- if (j < highest_frame) {
- if (Seek(frame_offsets[j])) {
- current_frame = j;
- decoder_command_finished(*decoder);
- } else
- decoder_seek_error(*decoder);
- } else {
- seek_where = decoder_seek_where(*decoder);
- mute_frame = MUTEFRAME_SEEK;
- decoder_command_finished(*decoder);
- }
- } else if (cmd != DecoderCommand::NONE)
- return false;
- }
-
- while (true) {
- bool skip = false;
-
- do {
- Tag *tag = nullptr;
-
- ret = DecodeNextFrameHeader(&tag);
-
- if (tag != nullptr) {
- decoder_tag(*decoder, input_stream,
- std::move(*tag));
- delete tag;
- }
- } while (ret == DECODE_CONT);
- if (ret == DECODE_BREAK)
- return false;
- else if (ret == DECODE_SKIP)
- skip = true;
-
- if (mute_frame == MUTEFRAME_NONE) {
- do {
- ret = DecodeNextFrame();
- } while (ret == DECODE_CONT);
- if (ret == DECODE_BREAK)
- return false;
- }
-
- if (!skip && ret == DECODE_OK)
- break;
- }
-
- return ret != DECODE_BREAK;
-}
-
-static void
-mp3_decode(Decoder &decoder, InputStream &input_stream)
-{
- MadDecoder data(&decoder, input_stream);
-
- Tag *tag = nullptr;
- if (!data.DecodeFirstFrame(&tag)) {
- delete tag;
-
- if (decoder_get_command(decoder) == DecoderCommand::NONE)
- LogError(mad_domain,
- "Input does not appear to be a mp3 bit stream");
- return;
- }
-
- Error error;
- AudioFormat audio_format;
- if (!audio_format_init_checked(audio_format,
- data.frame.header.samplerate,
- SampleFormat::S24_P32,
- MAD_NCHANNELS(&data.frame.header),
- error)) {
- LogError(error);
- delete tag;
- return;
- }
-
- decoder_initialized(decoder, audio_format,
- input_stream.IsSeekable(),
- data.total_time);
-
- if (tag != nullptr) {
- decoder_tag(decoder, input_stream, std::move(*tag));
- delete tag;
- }
-
- while (data.Read()) {}
-}
-
-static bool
-mad_decoder_scan_stream(InputStream &is,
- const struct tag_handler *handler, void *handler_ctx)
-{
- int total_time;
-
- total_time = mad_decoder_total_file_time(is);
- if (total_time < 0)
- return false;
-
- tag_handler_invoke_duration(handler, handler_ctx, total_time);
- return true;
-}
-
-static const char *const mp3_suffixes[] = { "mp3", "mp2", nullptr };
-static const char *const mp3_mime_types[] = { "audio/mpeg", nullptr };
-
-const struct DecoderPlugin mad_decoder_plugin = {
- "mad",
- mp3_plugin_init,
- nullptr,
- mp3_decode,
- nullptr,
- nullptr,
- mad_decoder_scan_stream,
- nullptr,
- mp3_suffixes,
- mp3_mime_types,
-};