decoder/*: move to decoder/plugins/
This commit is contained in:
Max Kellermann
464
src/decoder/plugins/FaadDecoderPlugin.cxx
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464
src/decoder/plugins/FaadDecoderPlugin.cxx
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@@ -0,0 +1,464 @@
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/*
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* Copyright (C) 2003-2014 The Music Player Daemon Project
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* 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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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "FaadDecoderPlugin.hxx"
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#include "../DecoderAPI.hxx"
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#include "../DecoderBuffer.hxx"
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#include "InputStream.hxx"
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#include "CheckAudioFormat.hxx"
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#include "tag/TagHandler.hxx"
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#include "util/ConstBuffer.hxx"
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#include "util/Error.hxx"
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#include "util/Domain.hxx"
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#include "Log.hxx"
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#include <neaacdec.h>
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#include <assert.h>
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#include <string.h>
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#include <unistd.h>
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#define AAC_MAX_CHANNELS 6
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static const unsigned adts_sample_rates[] =
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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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static constexpr Domain faad_decoder_domain("faad_decoder");
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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
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adts_check_frame(const unsigned char *data)
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{
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/* check syncword */
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if (!((data[0] == 0xFF) && ((data[1] & 0xF6) == 0xF0)))
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return 0;
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return (((unsigned int)data[3] & 0x3) << 11) |
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(((unsigned int)data[4]) << 3) |
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(data[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
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adts_find_frame(DecoderBuffer *buffer)
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{
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while (true) {
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auto data = ConstBuffer<uint8_t>::FromVoid(decoder_buffer_read(buffer));
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if (data.size < 8) {
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/* not enough data yet */
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if (!decoder_buffer_fill(buffer))
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/* failed */
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return 0;
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continue;
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}
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/* find the 0xff marker */
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const uint8_t *p = (const uint8_t *)
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memchr(data.data, 0xff, data.size);
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if (p == nullptr) {
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/* no marker - discard the buffer */
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decoder_buffer_clear(buffer);
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continue;
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}
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if (p > data.data) {
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/* discard data before 0xff */
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decoder_buffer_consume(buffer, p - data.data);
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continue;
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}
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/* is it a frame? */
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size_t frame_length = adts_check_frame(data.data);
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if (frame_length == 0) {
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/* it's just some random 0xff byte; discard it
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and continue searching */
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decoder_buffer_consume(buffer, 1);
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continue;
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}
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if (data.size < frame_length) {
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/* available buffer size is smaller than the
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frame will be - attempt to read more
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data */
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if (!decoder_buffer_fill(buffer)) {
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/* not enough data; discard this frame
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to prevent a possible buffer
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overflow */
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decoder_buffer_clear(buffer);
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}
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continue;
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}
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/* found a full frame! */
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return frame_length;
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}
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}
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static float
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adts_song_duration(DecoderBuffer *buffer)
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{
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unsigned sample_rate = 0;
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/* Read all frames to ensure correct time and bitrate */
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unsigned frames = 0;
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for (;; frames++) {
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unsigned frame_length = adts_find_frame(buffer);
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if (frame_length == 0)
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break;
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if (frames == 0) {
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auto data = ConstBuffer<uint8_t>::FromVoid(decoder_buffer_read(buffer));
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assert(!data.IsEmpty());
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assert(frame_length <= data.size);
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sample_rate = adts_sample_rates[(data.data[2] & 0x3c) >> 2];
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}
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decoder_buffer_consume(buffer, frame_length);
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}
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float frames_per_second = (float)sample_rate / 1024.0;
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if (frames_per_second <= 0)
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return -1;
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return (float)frames / frames_per_second;
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}
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static float
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faad_song_duration(DecoderBuffer *buffer, InputStream &is)
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{
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const auto size = is.GetSize();
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const size_t fileread = size >= 0 ? size : 0;
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decoder_buffer_fill(buffer);
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auto data = ConstBuffer<uint8_t>::FromVoid(decoder_buffer_read(buffer));
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if (data.IsEmpty())
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return -1;
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size_t tagsize = 0;
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if (data.size >= 10 && !memcmp(data.data, "ID3", 3)) {
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/* skip the ID3 tag */
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tagsize = (data.data[6] << 21) | (data.data[7] << 14) |
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(data.data[8] << 7) | (data.data[9] << 0);
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tagsize += 10;
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bool success = decoder_buffer_skip(buffer, tagsize) &&
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decoder_buffer_fill(buffer);
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if (!success)
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return -1;
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data = ConstBuffer<uint8_t>::FromVoid(decoder_buffer_read(buffer));
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if (data.IsEmpty())
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return -1;
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}
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if (is.IsSeekable() && data.size >= 2 &&
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data.data[0] == 0xFF && ((data.data[1] & 0xF6) == 0xF0)) {
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/* obtain the duration from the ADTS header */
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float song_length = adts_song_duration(buffer);
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is.LockSeek(tagsize, SEEK_SET, IgnoreError());
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decoder_buffer_clear(buffer);
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decoder_buffer_fill(buffer);
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return song_length;
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} else if (data.size >= 5 && memcmp(data.data, "ADIF", 4) == 0) {
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/* obtain the duration from the ADIF header */
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unsigned bit_rate;
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size_t skip_size = (data.data[4] & 0x80) ? 9 : 0;
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if (8 + skip_size > data.size)
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/* not enough data yet; skip parsing this
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header */
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return -1;
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bit_rate = ((data.data[4 + skip_size] & 0x0F) << 19) |
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(data.data[5 + skip_size] << 11) |
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(data.data[6 + skip_size] << 3) |
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(data.data[7 + skip_size] & 0xE0);
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if (fileread != 0 && bit_rate != 0)
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return fileread * 8.0 / bit_rate;
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else
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return fileread;
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} else
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return -1;
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}
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/**
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* Wrapper for NeAACDecInit() which works around some API
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* inconsistencies in libfaad.
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*/
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static bool
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faad_decoder_init(NeAACDecHandle decoder, DecoderBuffer *buffer,
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AudioFormat &audio_format, Error &error)
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{
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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_p = (unsigned long *)(void *)&sample_rate;
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#else
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uint32_t *sample_rate_p = &sample_rate;
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#endif
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auto data = ConstBuffer<uint8_t>::FromVoid(decoder_buffer_read(buffer));
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if (data.IsEmpty()) {
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error.Set(faad_decoder_domain, "Empty file");
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return false;
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}
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uint8_t channels;
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int32_t nbytes = NeAACDecInit(decoder,
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/* deconst hack, libfaad requires this */
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const_cast<uint8_t *>(data.data),
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data.size,
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sample_rate_p, &channels);
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if (nbytes < 0) {
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error.Set(faad_decoder_domain, "Not an AAC stream");
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return false;
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}
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decoder_buffer_consume(buffer, nbytes);
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return audio_format_init_checked(audio_format, sample_rate,
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SampleFormat::S16, channels, error);
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}
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/**
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* Wrapper for NeAACDecDecode() which works around some API
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* inconsistencies in libfaad.
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*/
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static const void *
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faad_decoder_decode(NeAACDecHandle decoder, DecoderBuffer *buffer,
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NeAACDecFrameInfo *frame_info)
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{
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auto data = ConstBuffer<uint8_t>::FromVoid(decoder_buffer_read(buffer));
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if (data.IsEmpty())
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return nullptr;
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return NeAACDecDecode(decoder, frame_info,
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/* deconst hack, libfaad requires this */
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const_cast<uint8_t *>(data.data),
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data.size);
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}
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/**
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* Get a song file's total playing time in seconds, as a float.
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* Returns 0 if the duration is unknown, and a negative value if the
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* file is invalid.
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*/
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static float
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faad_get_file_time_float(InputStream &is)
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{
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DecoderBuffer *buffer =
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decoder_buffer_new(nullptr, is,
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FAAD_MIN_STREAMSIZE * AAC_MAX_CHANNELS);
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float length = faad_song_duration(buffer, is);
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if (length < 0) {
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NeAACDecHandle decoder = NeAACDecOpen();
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NeAACDecConfigurationPtr config =
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NeAACDecGetCurrentConfiguration(decoder);
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config->outputFormat = FAAD_FMT_16BIT;
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NeAACDecSetConfiguration(decoder, config);
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decoder_buffer_fill(buffer);
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AudioFormat audio_format;
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if (faad_decoder_init(decoder, buffer, audio_format,
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IgnoreError()))
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length = 0;
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NeAACDecClose(decoder);
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}
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decoder_buffer_free(buffer);
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return length;
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}
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/**
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* Get a song file's total playing time in seconds, as an int.
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* Returns 0 if the duration is unknown, and a negative value if the
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* file is invalid.
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*/
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static int
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faad_get_file_time(InputStream &is)
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{
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int file_time = -1;
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float length;
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if ((length = faad_get_file_time_float(is)) >= 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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faad_stream_decode(Decoder &mpd_decoder, InputStream &is)
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{
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DecoderBuffer *buffer =
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decoder_buffer_new(&mpd_decoder, is,
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FAAD_MIN_STREAMSIZE * AAC_MAX_CHANNELS);
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const float total_time = faad_song_duration(buffer, is);
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/* create the libfaad decoder */
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NeAACDecHandle decoder = NeAACDecOpen();
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NeAACDecConfigurationPtr config =
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NeAACDecGetCurrentConfiguration(decoder);
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config->outputFormat = FAAD_FMT_16BIT;
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config->downMatrix = 1;
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config->dontUpSampleImplicitSBR = 0;
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NeAACDecSetConfiguration(decoder, config);
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while (!decoder_buffer_is_full(buffer) && !is.LockIsEOF() &&
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decoder_get_command(mpd_decoder) == DecoderCommand::NONE) {
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adts_find_frame(buffer);
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decoder_buffer_fill(buffer);
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}
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/* initialize it */
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Error error;
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AudioFormat audio_format;
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if (!faad_decoder_init(decoder, buffer, audio_format, error)) {
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LogError(error);
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NeAACDecClose(decoder);
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decoder_buffer_free(buffer);
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return;
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}
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/* initialize the MPD core */
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decoder_initialized(mpd_decoder, audio_format, false, total_time);
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/* the decoder loop */
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DecoderCommand cmd;
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unsigned bit_rate = 0;
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do {
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size_t frame_size;
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const void *decoded;
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NeAACDecFrameInfo frame_info;
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/* find the next frame */
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frame_size = adts_find_frame(buffer);
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if (frame_size == 0)
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/* end of file */
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break;
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/* decode it */
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decoded = faad_decoder_decode(decoder, buffer, &frame_info);
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if (frame_info.error > 0) {
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FormatWarning(faad_decoder_domain,
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"error decoding AAC stream: %s",
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NeAACDecGetErrorMessage(frame_info.error));
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break;
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}
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if (frame_info.channels != audio_format.channels) {
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FormatDefault(faad_decoder_domain,
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"channel count changed from %u to %u",
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audio_format.channels, frame_info.channels);
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break;
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}
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if (frame_info.samplerate != audio_format.sample_rate) {
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FormatDefault(faad_decoder_domain,
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"sample rate changed from %u to %lu",
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audio_format.sample_rate,
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(unsigned long)frame_info.samplerate);
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break;
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}
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decoder_buffer_consume(buffer, frame_info.bytesconsumed);
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/* update bit rate and position */
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if (frame_info.samples > 0) {
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bit_rate = frame_info.bytesconsumed * 8.0 *
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frame_info.channels * audio_format.sample_rate /
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frame_info.samples / 1000 + 0.5;
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}
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/* send PCM samples to MPD */
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cmd = decoder_data(mpd_decoder, is, decoded,
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(size_t)frame_info.samples * 2,
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bit_rate);
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} while (cmd != DecoderCommand::STOP);
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/* cleanup */
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NeAACDecClose(decoder);
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decoder_buffer_free(buffer);
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}
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static bool
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faad_scan_stream(InputStream &is,
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const struct tag_handler *handler, void *handler_ctx)
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{
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int file_time = faad_get_file_time(is);
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if (file_time < 0)
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return false;
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tag_handler_invoke_duration(handler, handler_ctx, file_time);
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return true;
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}
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static const char *const faad_suffixes[] = { "aac", nullptr };
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static const char *const faad_mime_types[] = {
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"audio/aac", "audio/aacp", nullptr
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};
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const DecoderPlugin faad_decoder_plugin = {
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"faad",
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nullptr,
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nullptr,
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faad_stream_decode,
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nullptr,
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nullptr,
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faad_scan_stream,
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nullptr,
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faad_suffixes,
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faad_mime_types,
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};
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