renamed decoder plugin "aac" to "faad"
A decoder plugin should be named after the library which is used.
This commit is contained in:
Max Kellermann
469
src/decoder/faad_plugin.c
Normal file
469
src/decoder/faad_plugin.c
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@@ -0,0 +1,469 @@
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/* the Music Player Daemon (MPD)
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* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
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* This project's homepage is: http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "../decoder_api.h"
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#include "config.h"
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#define AAC_MAX_CHANNELS 6
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#include <assert.h>
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#include <unistd.h>
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#include <faad.h>
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#include <glib.h>
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#undef G_LOG_DOMAIN
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#define G_LOG_DOMAIN "aac"
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/* all code here is either based on or copied from FAAD2's frontend code */
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typedef struct {
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struct decoder *decoder;
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struct input_stream *inStream;
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size_t bytesIntoBuffer;
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size_t bytesConsumed;
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off_t fileOffset;
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unsigned char buffer[FAAD_MIN_STREAMSIZE * AAC_MAX_CHANNELS];
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} AacBuffer;
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static void aac_buffer_shift(AacBuffer * b, size_t length)
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{
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assert(length >= b->bytesConsumed);
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assert(length <= b->bytesConsumed + b->bytesIntoBuffer);
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memmove(b->buffer, b->buffer + length,
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b->bytesConsumed + b->bytesIntoBuffer - length);
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length -= b->bytesConsumed;
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b->bytesConsumed = 0;
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b->bytesIntoBuffer -= length;
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}
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static void fillAacBuffer(AacBuffer * b)
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{
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size_t rest, bread;
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if (b->bytesConsumed > 0)
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aac_buffer_shift(b, b->bytesConsumed);
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rest = sizeof(b->buffer) - b->bytesIntoBuffer;
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if (rest == 0)
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/* buffer already full */
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return;
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bread = decoder_read(b->decoder, b->inStream,
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(void *)(b->buffer + b->bytesIntoBuffer),
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rest);
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b->bytesIntoBuffer += bread;
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if ((b->bytesIntoBuffer > 3 && memcmp(b->buffer, "TAG", 3) == 0) ||
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(b->bytesIntoBuffer > 11 &&
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memcmp(b->buffer, "LYRICSBEGIN", 11) == 0) ||
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(b->bytesIntoBuffer > 8 && memcmp(b->buffer, "APETAGEX", 8) == 0))
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b->bytesIntoBuffer = 0;
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}
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static void advanceAacBuffer(AacBuffer * b, size_t bytes)
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{
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b->fileOffset += bytes;
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b->bytesConsumed = bytes;
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b->bytesIntoBuffer -= bytes;
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}
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static const unsigned adtsSampleRates[] =
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{ 96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050,
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16000, 12000, 11025, 8000, 7350, 0, 0, 0
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};
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/**
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* Check whether the buffer head is an AAC frame, and return the frame
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* length. Returns 0 if it is not a frame.
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*/
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static size_t adts_check_frame(AacBuffer * b)
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{
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if (b->bytesIntoBuffer <= 7)
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return 0;
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/* check syncword */
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if (!((b->buffer[0] == 0xFF) && ((b->buffer[1] & 0xF6) == 0xF0)))
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return 0;
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return (((unsigned int)b->buffer[3] & 0x3) << 11) |
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(((unsigned int)b->buffer[4]) << 3) |
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(b->buffer[5] >> 5);
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}
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/**
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* Find the next AAC frame in the buffer. Returns 0 if no frame is
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* found or if not enough data is available.
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*/
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static size_t adts_find_frame(AacBuffer * b)
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{
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const unsigned char *p;
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size_t frame_length;
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while ((p = memchr(b->buffer, 0xff, b->bytesIntoBuffer)) != NULL) {
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/* discard data before 0xff */
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if (p > b->buffer)
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aac_buffer_shift(b, p - b->buffer);
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if (b->bytesIntoBuffer <= 7)
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/* not enough data yet */
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return 0;
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/* is it a frame? */
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frame_length = adts_check_frame(b);
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if (frame_length > 0)
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/* yes, it is */
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return frame_length;
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/* it's just some random 0xff byte; discard and and
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continue searching */
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aac_buffer_shift(b, 1);
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}
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/* nothing at all; discard the whole buffer */
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aac_buffer_shift(b, b->bytesIntoBuffer);
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return 0;
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}
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static void adtsParse(AacBuffer * b, float *length)
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{
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unsigned int frames, frameLength;
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unsigned sample_rate = 0;
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float framesPerSec;
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/* Read all frames to ensure correct time and bitrate */
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for (frames = 0;; frames++) {
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fillAacBuffer(b);
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frameLength = adts_find_frame(b);
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if (frameLength > 0) {
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if (frames == 0) {
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sample_rate = adtsSampleRates[(b->
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buffer[2] & 0x3c)
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>> 2];
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}
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if (frameLength > b->bytesIntoBuffer)
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break;
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advanceAacBuffer(b, frameLength);
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} else
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break;
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}
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framesPerSec = (float)sample_rate / 1024.0;
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if (framesPerSec > 0)
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*length = (float)frames / framesPerSec;
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}
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static void
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initAacBuffer(AacBuffer * b, struct decoder *decoder,
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struct input_stream *inStream)
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{
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memset(b, 0, sizeof(AacBuffer));
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b->decoder = decoder;
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b->inStream = inStream;
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}
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static void aac_parse_header(AacBuffer * b, float *length)
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{
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size_t fileread;
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size_t tagsize;
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if (length)
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*length = -1;
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fileread = b->inStream->size >= 0 ? b->inStream->size : 0;
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fillAacBuffer(b);
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tagsize = 0;
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if (b->bytesIntoBuffer >= 10 && !memcmp(b->buffer, "ID3", 3)) {
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tagsize = (b->buffer[6] << 21) | (b->buffer[7] << 14) |
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(b->buffer[8] << 7) | (b->buffer[9] << 0);
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tagsize += 10;
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advanceAacBuffer(b, tagsize);
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fillAacBuffer(b);
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}
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if (length == NULL)
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return;
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if (b->inStream->seekable &&
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b->bytesIntoBuffer >= 2 &&
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(b->buffer[0] == 0xFF) && ((b->buffer[1] & 0xF6) == 0xF0)) {
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adtsParse(b, length);
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input_stream_seek(b->inStream, tagsize, SEEK_SET);
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b->bytesIntoBuffer = 0;
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b->bytesConsumed = 0;
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b->fileOffset = tagsize;
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fillAacBuffer(b);
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} else if (memcmp(b->buffer, "ADIF", 4) == 0) {
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unsigned bitRate;
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size_t skipSize = (b->buffer[4] & 0x80) ? 9 : 0;
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if (8 + skipSize > b->bytesIntoBuffer)
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/* not enough data yet; skip parsing this
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header */
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return;
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bitRate =
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((unsigned int)(b->
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buffer[4 +
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skipSize] & 0x0F) << 19) | ((unsigned
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int)b->
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buffer[5
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+
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skipSize]
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<< 11) |
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((unsigned int)b->
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buffer[6 + skipSize] << 3) | ((unsigned int)b->buffer[7 +
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skipSize]
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& 0xE0);
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if (fileread != 0 && bitRate != 0)
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*length = fileread * 8.0 / bitRate;
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else
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*length = fileread;
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}
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}
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static float getAacFloatTotalTime(const char *file)
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{
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AacBuffer b;
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float length;
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faacDecHandle decoder;
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faacDecConfigurationPtr config;
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uint32_t sample_rate;
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#ifdef HAVE_FAAD_LONG
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/* neaacdec.h declares all arguments as "unsigned long", but
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internally expects uint32_t pointers. To avoid gcc
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warnings, use this workaround. */
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unsigned long *sample_rate_r = (unsigned long *)(void *)&sample_rate;
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#else
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uint32_t *sample_rate_r = &sample_rate;
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#endif
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unsigned char channels;
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struct input_stream inStream;
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long bread;
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if (!input_stream_open(&inStream, file))
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return -1;
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initAacBuffer(&b, NULL, &inStream);
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aac_parse_header(&b, &length);
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if (length < 0) {
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decoder = faacDecOpen();
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config = faacDecGetCurrentConfiguration(decoder);
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config->outputFormat = FAAD_FMT_16BIT;
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faacDecSetConfiguration(decoder, config);
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fillAacBuffer(&b);
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#ifdef HAVE_FAAD_BUFLEN_FUNCS
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bread = faacDecInit(decoder, b.buffer, b.bytesIntoBuffer,
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sample_rate_r, &channels);
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#else
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bread = faacDecInit(decoder, b.buffer, sample_rate_r, &channels);
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#endif
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if (bread >= 0 && sample_rate > 0 && channels > 0)
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length = 0;
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faacDecClose(decoder);
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}
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input_stream_close(&inStream);
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return length;
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}
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static int getAacTotalTime(const char *file)
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{
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int file_time = -1;
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float length;
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if ((length = getAacFloatTotalTime(file)) >= 0)
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file_time = length + 0.5;
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return file_time;
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}
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static void
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aac_stream_decode(struct decoder *mpd_decoder, struct input_stream *inStream)
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{
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float file_time;
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float totalTime = 0;
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faacDecHandle decoder;
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faacDecFrameInfo frameInfo;
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faacDecConfigurationPtr config;
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long bread;
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uint32_t sample_rate;
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#ifdef HAVE_FAAD_LONG
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/* neaacdec.h declares all arguments as "unsigned long", but
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internally expects uint32_t pointers. To avoid gcc
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warnings, use this workaround. */
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unsigned long *sample_rate_r = (unsigned long *)(void *)&sample_rate;
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#else
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uint32_t *sample_rate_r = &sample_rate;
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#endif
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unsigned char channels;
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unsigned int sampleCount;
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char *sampleBuffer;
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size_t sampleBufferLen;
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uint16_t bitRate = 0;
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AacBuffer b;
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bool initialized = false;
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enum decoder_command cmd;
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initAacBuffer(&b, mpd_decoder, inStream);
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aac_parse_header(&b, &totalTime);
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decoder = faacDecOpen();
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config = faacDecGetCurrentConfiguration(decoder);
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config->outputFormat = FAAD_FMT_16BIT;
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#ifdef HAVE_FAACDECCONFIGURATION_DOWNMATRIX
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config->downMatrix = 1;
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#endif
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#ifdef HAVE_FAACDECCONFIGURATION_DONTUPSAMPLEIMPLICITSBR
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config->dontUpSampleImplicitSBR = 0;
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#endif
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faacDecSetConfiguration(decoder, config);
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while (b.bytesIntoBuffer < sizeof(b.buffer) &&
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!input_stream_eof(b.inStream) &&
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decoder_get_command(mpd_decoder) == DECODE_COMMAND_NONE) {
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fillAacBuffer(&b);
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adts_find_frame(&b);
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fillAacBuffer(&b);
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}
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#ifdef HAVE_FAAD_BUFLEN_FUNCS
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bread = faacDecInit(decoder, b.buffer, b.bytesIntoBuffer,
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sample_rate_r, &channels);
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#else
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bread = faacDecInit(decoder, b.buffer, sample_rate_r, &channels);
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#endif
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if (bread < 0) {
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g_warning("Error not a AAC stream.\n");
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faacDecClose(decoder);
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return;
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}
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file_time = 0.0;
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advanceAacBuffer(&b, bread);
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do {
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fillAacBuffer(&b);
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adts_find_frame(&b);
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fillAacBuffer(&b);
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if (b.bytesIntoBuffer == 0)
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break;
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#ifdef HAVE_FAAD_BUFLEN_FUNCS
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sampleBuffer = faacDecDecode(decoder, &frameInfo, b.buffer,
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b.bytesIntoBuffer);
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#else
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sampleBuffer = faacDecDecode(decoder, &frameInfo, b.buffer);
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#endif
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if (frameInfo.error > 0) {
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g_warning("error decoding AAC stream: %s\n",
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faacDecGetErrorMessage(frameInfo.error));
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break;
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}
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#ifdef HAVE_FAACDECFRAMEINFO_SAMPLERATE
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sample_rate = frameInfo.samplerate;
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#endif
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if (!initialized) {
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const struct audio_format audio_format = {
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.bits = 16,
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.channels = frameInfo.channels,
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.sample_rate = sample_rate,
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};
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if (!audio_format_valid(&audio_format)) {
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g_warning("aac: invalid audio format\n");
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break;
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}
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decoder_initialized(mpd_decoder, &audio_format,
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false, totalTime);
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initialized = true;
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}
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advanceAacBuffer(&b, frameInfo.bytesconsumed);
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sampleCount = (unsigned long)(frameInfo.samples);
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if (sampleCount > 0) {
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bitRate = frameInfo.bytesconsumed * 8.0 *
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frameInfo.channels * sample_rate /
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frameInfo.samples / 1000 + 0.5;
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file_time +=
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(float)(frameInfo.samples) / frameInfo.channels /
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sample_rate;
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}
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sampleBufferLen = sampleCount * 2;
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cmd = decoder_data(mpd_decoder, inStream, sampleBuffer,
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sampleBufferLen, file_time,
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bitRate, NULL);
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if (cmd == DECODE_COMMAND_SEEK)
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decoder_seek_error(mpd_decoder);
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} while (cmd != DECODE_COMMAND_STOP);
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faacDecClose(decoder);
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}
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static struct tag *aacTagDup(const char *file)
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{
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int file_time = getAacTotalTime(file);
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struct tag *tag;
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if (file_time < 0) {
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g_debug("aacTagDup: Failed to get total song time from: %s\n",
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file);
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return NULL;
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}
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tag = tag_new();
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tag->time = file_time;
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return tag;
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}
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static const char *const aac_suffixes[] = { "aac", NULL };
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static const char *const aac_mimeTypes[] = { "audio/aac", "audio/aacp", NULL };
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const struct decoder_plugin faad_decoder_plugin = {
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.name = "faad",
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.stream_decode = aac_stream_decode,
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.tag_dup = aacTagDup,
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.suffixes = aac_suffixes,
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.mime_types = aac_mimeTypes
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};
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