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-rw-r--r--src/DecoderAPI.cxx567
1 files changed, 567 insertions, 0 deletions
diff --git a/src/DecoderAPI.cxx b/src/DecoderAPI.cxx
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--- /dev/null
+++ b/src/DecoderAPI.cxx
@@ -0,0 +1,567 @@
+/*
+ * 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 "decoder_api.h"
+#include "AudioConfig.hxx"
+#include "replay_gain_config.h"
+#include "MusicChunk.hxx"
+#include "MusicBuffer.hxx"
+#include "MusicPipe.hxx"
+#include "DecoderControl.hxx"
+#include "DecoderInternal.hxx"
+#include "song.h"
+#include "InputStream.hxx"
+
+#include <glib.h>
+
+#include <assert.h>
+#include <stdlib.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "decoder"
+
+void
+decoder_initialized(struct decoder *decoder,
+ const struct audio_format *audio_format,
+ bool seekable, float total_time)
+{
+ struct decoder_control *dc = decoder->dc;
+ struct audio_format_string af_string;
+
+ assert(dc->state == DECODE_STATE_START);
+ assert(dc->pipe != NULL);
+ assert(decoder != NULL);
+ assert(decoder->stream_tag == NULL);
+ assert(decoder->decoder_tag == NULL);
+ assert(!decoder->seeking);
+ assert(audio_format != NULL);
+ assert(audio_format_defined(audio_format));
+ assert(audio_format_valid(audio_format));
+
+ dc->in_audio_format = *audio_format;
+ getOutputAudioFormat(audio_format, &dc->out_audio_format);
+
+ dc->seekable = seekable;
+ dc->total_time = total_time;
+
+ dc->Lock();
+ dc->state = DECODE_STATE_DECODE;
+ dc->client_cond.signal();
+ dc->Unlock();
+
+ g_debug("audio_format=%s, seekable=%s",
+ audio_format_to_string(&dc->in_audio_format, &af_string),
+ seekable ? "true" : "false");
+
+ if (!audio_format_equals(&dc->in_audio_format,
+ &dc->out_audio_format))
+ g_debug("converting to %s",
+ audio_format_to_string(&dc->out_audio_format,
+ &af_string));
+}
+
+/**
+ * Checks if we need an "initial seek". If so, then the initial seek
+ * is prepared, and the function returns true.
+ */
+G_GNUC_PURE
+static bool
+decoder_prepare_initial_seek(struct decoder *decoder)
+{
+ const struct decoder_control *dc = decoder->dc;
+ assert(dc->pipe != NULL);
+
+ if (dc->state != DECODE_STATE_DECODE)
+ /* wait until the decoder has finished initialisation
+ (reading file headers etc.) before emitting the
+ virtual "SEEK" command */
+ return false;
+
+ if (decoder->initial_seek_running)
+ /* initial seek has already begun - override any other
+ command */
+ return true;
+
+ if (decoder->initial_seek_pending) {
+ if (!dc->seekable) {
+ /* seeking is not possible */
+ decoder->initial_seek_pending = false;
+ return false;
+ }
+
+ if (dc->command == DECODE_COMMAND_NONE) {
+ /* begin initial seek */
+
+ decoder->initial_seek_pending = false;
+ decoder->initial_seek_running = true;
+ return true;
+ }
+
+ /* skip initial seek when there's another command
+ (e.g. STOP) */
+
+ decoder->initial_seek_pending = false;
+ }
+
+ return false;
+}
+
+/**
+ * Returns the current decoder command. May return a "virtual"
+ * synthesized command, e.g. to seek to the beginning of the CUE
+ * track.
+ */
+G_GNUC_PURE
+static enum decoder_command
+decoder_get_virtual_command(struct decoder *decoder)
+{
+ const struct decoder_control *dc = decoder->dc;
+ assert(dc->pipe != NULL);
+
+ if (decoder_prepare_initial_seek(decoder))
+ return DECODE_COMMAND_SEEK;
+
+ return dc->command;
+}
+
+enum decoder_command
+decoder_get_command(struct decoder *decoder)
+{
+ return decoder_get_virtual_command(decoder);
+}
+
+void
+decoder_command_finished(struct decoder *decoder)
+{
+ struct decoder_control *dc = decoder->dc;
+
+ dc->Lock();
+
+ assert(dc->command != DECODE_COMMAND_NONE ||
+ decoder->initial_seek_running);
+ assert(dc->command != DECODE_COMMAND_SEEK ||
+ decoder->initial_seek_running ||
+ dc->seek_error || decoder->seeking);
+ assert(dc->pipe != NULL);
+
+ if (decoder->initial_seek_running) {
+ assert(!decoder->seeking);
+ assert(decoder->chunk == NULL);
+ assert(music_pipe_empty(dc->pipe));
+
+ decoder->initial_seek_running = false;
+ decoder->timestamp = dc->start_ms / 1000.;
+ dc->Unlock();
+ return;
+ }
+
+ if (decoder->seeking) {
+ decoder->seeking = false;
+
+ /* delete frames from the old song position */
+
+ if (decoder->chunk != NULL) {
+ music_buffer_return(dc->buffer, decoder->chunk);
+ decoder->chunk = NULL;
+ }
+
+ music_pipe_clear(dc->pipe, dc->buffer);
+
+ decoder->timestamp = dc->seek_where;
+ }
+
+ dc->command = DECODE_COMMAND_NONE;
+ dc->client_cond.signal();
+ dc->Unlock();
+}
+
+double decoder_seek_where(G_GNUC_UNUSED struct decoder * decoder)
+{
+ const struct decoder_control *dc = decoder->dc;
+
+ assert(dc->pipe != NULL);
+
+ if (decoder->initial_seek_running)
+ return dc->start_ms / 1000.;
+
+ assert(dc->command == DECODE_COMMAND_SEEK);
+
+ decoder->seeking = true;
+
+ return dc->seek_where;
+}
+
+void decoder_seek_error(struct decoder * decoder)
+{
+ struct decoder_control *dc = decoder->dc;
+
+ assert(dc->pipe != NULL);
+
+ if (decoder->initial_seek_running) {
+ /* d'oh, we can't seek to the sub-song start position,
+ what now? - no idea, ignoring the problem for now. */
+ decoder->initial_seek_running = false;
+ return;
+ }
+
+ assert(dc->command == DECODE_COMMAND_SEEK);
+
+ dc->seek_error = true;
+ decoder->seeking = false;
+
+ decoder_command_finished(decoder);
+}
+
+/**
+ * Should be read operation be cancelled? That is the case when the
+ * player thread has sent a command such as "STOP".
+ */
+G_GNUC_PURE
+static inline bool
+decoder_check_cancel_read(const struct decoder *decoder)
+{
+ if (decoder == NULL)
+ return false;
+
+ const struct decoder_control *dc = decoder->dc;
+ if (dc->command == DECODE_COMMAND_NONE)
+ return false;
+
+ /* ignore the SEEK command during initialization, the plugin
+ should handle that after it has initialized successfully */
+ if (dc->command == DECODE_COMMAND_SEEK &&
+ (dc->state == DECODE_STATE_START || decoder->seeking))
+ return false;
+
+ return true;
+}
+
+size_t decoder_read(struct decoder *decoder,
+ struct input_stream *is,
+ void *buffer, size_t length)
+{
+ /* XXX don't allow decoder==NULL */
+ GError *error = NULL;
+ size_t nbytes;
+
+ assert(decoder == NULL ||
+ decoder->dc->state == DECODE_STATE_START ||
+ decoder->dc->state == DECODE_STATE_DECODE);
+ assert(is != NULL);
+ assert(buffer != NULL);
+
+ if (length == 0)
+ return 0;
+
+ input_stream_lock(is);
+
+ while (true) {
+ if (decoder_check_cancel_read(decoder)) {
+ input_stream_unlock(is);
+ return 0;
+ }
+
+ if (input_stream_available(is))
+ break;
+
+ is->cond.wait(is->mutex);
+ }
+
+ nbytes = input_stream_read(is, buffer, length, &error);
+ assert(nbytes == 0 || error == NULL);
+ assert(nbytes > 0 || error != NULL || input_stream_eof(is));
+
+ if (G_UNLIKELY(nbytes == 0 && error != NULL)) {
+ g_warning("%s", error->message);
+ g_error_free(error);
+ }
+
+ input_stream_unlock(is);
+
+ return nbytes;
+}
+
+void
+decoder_timestamp(struct decoder *decoder, double t)
+{
+ assert(decoder != NULL);
+ assert(t >= 0);
+
+ decoder->timestamp = t;
+}
+
+/**
+ * Sends a #tag as-is to the music pipe. Flushes the current chunk
+ * (decoder.chunk) if there is one.
+ */
+static enum decoder_command
+do_send_tag(struct decoder *decoder, const struct tag *tag)
+{
+ struct music_chunk *chunk;
+
+ if (decoder->chunk != NULL) {
+ /* there is a partial chunk - flush it, we want the
+ tag in a new chunk */
+ decoder_flush_chunk(decoder);
+ decoder->dc->client_cond.signal();
+ }
+
+ assert(decoder->chunk == NULL);
+
+ chunk = decoder_get_chunk(decoder);
+ if (chunk == NULL) {
+ assert(decoder->dc->command != DECODE_COMMAND_NONE);
+ return decoder->dc->command;
+ }
+
+ chunk->tag = tag_dup(tag);
+ return DECODE_COMMAND_NONE;
+}
+
+static bool
+update_stream_tag(struct decoder *decoder, struct input_stream *is)
+{
+ struct tag *tag;
+
+ tag = is != NULL
+ ? input_stream_lock_tag(is)
+ : NULL;
+ if (tag == NULL) {
+ tag = decoder->song_tag;
+ if (tag == NULL)
+ return false;
+
+ /* no stream tag present - submit the song tag
+ instead */
+ decoder->song_tag = NULL;
+ }
+
+ if (decoder->stream_tag != NULL)
+ tag_free(decoder->stream_tag);
+
+ decoder->stream_tag = tag;
+ return true;
+}
+
+enum decoder_command
+decoder_data(struct decoder *decoder,
+ struct input_stream *is,
+ const void *data, size_t length,
+ uint16_t kbit_rate)
+{
+ struct decoder_control *dc = decoder->dc;
+ GError *error = NULL;
+ enum decoder_command cmd;
+
+ assert(dc->state == DECODE_STATE_DECODE);
+ assert(dc->pipe != NULL);
+ assert(length % audio_format_frame_size(&dc->in_audio_format) == 0);
+
+ dc->Lock();
+ cmd = decoder_get_virtual_command(decoder);
+ dc->Unlock();
+
+ if (cmd == DECODE_COMMAND_STOP || cmd == DECODE_COMMAND_SEEK ||
+ length == 0)
+ return cmd;
+
+ /* send stream tags */
+
+ if (update_stream_tag(decoder, is)) {
+ if (decoder->decoder_tag != NULL) {
+ /* merge with tag from decoder plugin */
+ struct tag *tag;
+
+ tag = tag_merge(decoder->decoder_tag,
+ decoder->stream_tag);
+ cmd = do_send_tag(decoder, tag);
+ tag_free(tag);
+ } else
+ /* send only the stream tag */
+ cmd = do_send_tag(decoder, decoder->stream_tag);
+
+ if (cmd != DECODE_COMMAND_NONE)
+ return cmd;
+ }
+
+ if (!audio_format_equals(&dc->in_audio_format, &dc->out_audio_format)) {
+ data = decoder->conv_state.Convert(&dc->in_audio_format,
+ data, length,
+ &dc->out_audio_format,
+ &length,
+ &error);
+ if (data == NULL) {
+ /* the PCM conversion has failed - stop
+ playback, since we have no better way to
+ bail out */
+ g_warning("%s", error->message);
+ return DECODE_COMMAND_STOP;
+ }
+ }
+
+ while (length > 0) {
+ struct music_chunk *chunk;
+ size_t nbytes;
+ bool full;
+
+ chunk = decoder_get_chunk(decoder);
+ if (chunk == NULL) {
+ assert(dc->command != DECODE_COMMAND_NONE);
+ return dc->command;
+ }
+
+ void *dest = chunk->Write(dc->out_audio_format,
+ decoder->timestamp -
+ dc->song->start_ms / 1000.0,
+ kbit_rate, &nbytes);
+ if (dest == NULL) {
+ /* the chunk is full, flush it */
+ decoder_flush_chunk(decoder);
+ dc->client_cond.signal();
+ continue;
+ }
+
+ assert(nbytes > 0);
+
+ if (nbytes > length)
+ nbytes = length;
+
+ /* copy the buffer */
+
+ memcpy(dest, data, nbytes);
+
+ /* expand the music pipe chunk */
+
+ full = chunk->Expand(dc->out_audio_format, nbytes);
+ if (full) {
+ /* the chunk is full, flush it */
+ decoder_flush_chunk(decoder);
+ dc->client_cond.signal();
+ }
+
+ data = (const uint8_t *)data + nbytes;
+ length -= nbytes;
+
+ decoder->timestamp += (double)nbytes /
+ audio_format_time_to_size(&dc->out_audio_format);
+
+ if (dc->end_ms > 0 &&
+ decoder->timestamp >= dc->end_ms / 1000.0)
+ /* the end of this range has been reached:
+ stop decoding */
+ return DECODE_COMMAND_STOP;
+ }
+
+ return DECODE_COMMAND_NONE;
+}
+
+enum decoder_command
+decoder_tag(G_GNUC_UNUSED struct decoder *decoder, struct input_stream *is,
+ const struct tag *tag)
+{
+ G_GNUC_UNUSED const struct decoder_control *dc = decoder->dc;
+ enum decoder_command cmd;
+
+ assert(dc->state == DECODE_STATE_DECODE);
+ assert(dc->pipe != NULL);
+ assert(tag != NULL);
+
+ /* save the tag */
+
+ if (decoder->decoder_tag != NULL)
+ tag_free(decoder->decoder_tag);
+ decoder->decoder_tag = tag_dup(tag);
+
+ /* check for a new stream tag */
+
+ update_stream_tag(decoder, is);
+
+ /* check if we're seeking */
+
+ if (decoder_prepare_initial_seek(decoder))
+ /* during initial seek, no music chunk must be created
+ until seeking is finished; skip the rest of the
+ function here */
+ return DECODE_COMMAND_SEEK;
+
+ /* send tag to music pipe */
+
+ if (decoder->stream_tag != NULL) {
+ /* merge with tag from input stream */
+ struct tag *merged;
+
+ merged = tag_merge(decoder->stream_tag, decoder->decoder_tag);
+ cmd = do_send_tag(decoder, merged);
+ tag_free(merged);
+ } else
+ /* send only the decoder tag */
+ cmd = do_send_tag(decoder, tag);
+
+ return cmd;
+}
+
+void
+decoder_replay_gain(struct decoder *decoder,
+ const struct replay_gain_info *replay_gain_info)
+{
+ assert(decoder != NULL);
+
+ if (replay_gain_info != NULL) {
+ static unsigned serial;
+ if (++serial == 0)
+ serial = 1;
+
+ if (REPLAY_GAIN_OFF != replay_gain_mode) {
+ enum replay_gain_mode rgm = replay_gain_mode;
+ if (rgm != REPLAY_GAIN_ALBUM)
+ rgm = REPLAY_GAIN_TRACK;
+
+ decoder->dc->replay_gain_db = 20.0 * log10f(
+ replay_gain_tuple_scale(
+ &replay_gain_info->tuples[rgm],
+ replay_gain_preamp, replay_gain_missing_preamp,
+ replay_gain_limit));
+ }
+
+ decoder->replay_gain_info = *replay_gain_info;
+ decoder->replay_gain_serial = serial;
+
+ if (decoder->chunk != NULL) {
+ /* flush the current chunk because the new
+ replay gain values affect the following
+ samples */
+ decoder_flush_chunk(decoder);
+ decoder->dc->client_cond.signal();
+ }
+ } else
+ decoder->replay_gain_serial = 0;
+}
+
+void
+decoder_mixramp(struct decoder *decoder,
+ char *mixramp_start, char *mixramp_end)
+{
+ assert(decoder != NULL);
+ struct decoder_control *dc = decoder->dc;
+ assert(dc != NULL);
+
+ dc->MixRampStart(mixramp_start);
+ dc->MixRampEnd(mixramp_end);
+}
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