From bad350bc18ab81661253bf42245b9e3fa175d026 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Fri, 25 Dec 2009 19:47:33 +0100
Subject: decoder_api: added function decoder_timestamp()

Remove the data_time parameter from decoder_data().  This patch
eliminates the timestamp counting in most decoder plugins, because the
MPD core will do it automatically by default.
---
 src/decoder/_flac_common.c           |  9 +--------
 src/decoder/audiofile_plugin.c       |  9 +++------
 src/decoder/faad_plugin.c            |  8 +-------
 src/decoder/ffmpeg_plugin.c          | 10 ++++------
 src/decoder/fluidsynth_plugin.c      |  2 +-
 src/decoder/mad_plugin.c             |  1 -
 src/decoder/mikmod_plugin.c          |  5 -----
 src/decoder/modplug_plugin.c         |  6 ------
 src/decoder/mp4ff_plugin.c           |  4 ++--
 src/decoder/mpcdec_plugin.c          | 16 ++++------------
 src/decoder/mpg123_decoder_plugin.c  |  6 +-----
 src/decoder/sidplay_plugin.cxx       |  8 ++++----
 src/decoder/sndfile_decoder_plugin.c |  3 +--
 src/decoder/vorbis_plugin.c          |  1 -
 src/decoder/wavpack_plugin.c         | 11 ++---------
 src/decoder/wildmidi_plugin.c        |  2 --
 src/decoder_api.c                    | 22 +++++++++++++++++++---
 src/decoder_api.h                    | 11 ++++++++++-
 src/decoder_internal.h               |  5 +++++
 src/decoder_thread.c                 |  1 +
 20 files changed, 59 insertions(+), 81 deletions(-)

(limited to 'src')

diff --git a/src/decoder/_flac_common.c b/src/decoder/_flac_common.c
index 70b2c0202..4dd2b46ea 100644
--- a/src/decoder/_flac_common.c
+++ b/src/decoder/_flac_common.c
@@ -161,7 +161,6 @@ flac_common_write(struct flac_data *data, const FLAC__Frame * frame,
 	enum decoder_command cmd;
 	size_t buffer_size = frame->header.blocksize * data->frame_size;
 	void *buffer;
-	float position;
 	unsigned bit_rate;
 
 	buffer = pcm_buffer_get(&data->buffer, buffer_size);
@@ -170,12 +169,6 @@ flac_common_write(struct flac_data *data, const FLAC__Frame * frame,
 		     data->sample_format, buf,
 		     0, frame->header.blocksize);
 
-	if (data->next_frame >= data->first_frame)
-		position = (float)(data->next_frame - data->first_frame) /
-			frame->header.sample_rate;
-	else
-		position = 0;
-
 	if (nbytes > 0)
 		bit_rate = nbytes * 8 * frame->header.sample_rate /
 			(1000 * frame->header.blocksize);
@@ -184,7 +177,7 @@ flac_common_write(struct flac_data *data, const FLAC__Frame * frame,
 
 	cmd = decoder_data(data->decoder, data->input_stream,
 			   buffer, buffer_size,
-			   position, bit_rate,
+			   bit_rate,
 			   data->replay_gain_info);
 	data->next_frame += frame->header.blocksize;
 	switch (cmd) {
diff --git a/src/decoder/audiofile_plugin.c b/src/decoder/audiofile_plugin.c
index a1fefcb0d..18cfdda5d 100644
--- a/src/decoder/audiofile_plugin.c
+++ b/src/decoder/audiofile_plugin.c
@@ -160,7 +160,7 @@ audiofile_stream_decode(struct decoder *decoder, struct input_stream *is)
 	struct audio_format audio_format;
 	float total_time;
 	uint16_t bit_rate;
-	int ret, current = 0;
+	int ret;
 	char chunk[CHUNK_SIZE];
 	enum decoder_command cmd;
 
@@ -204,17 +204,14 @@ audiofile_stream_decode(struct decoder *decoder, struct input_stream *is)
 		if (ret <= 0)
 			break;
 
-		current += ret;
 		cmd = decoder_data(decoder, NULL,
 				   chunk, ret * fs,
-				   (float)current /
-				   (float)audio_format.sample_rate,
 				   bit_rate, NULL);
 
 		if (cmd == DECODE_COMMAND_SEEK) {
-			current = decoder_seek_where(decoder) *
+			AFframecount frame = decoder_seek_where(decoder) *
 				audio_format.sample_rate;
-			afSeekFrame(af_fp, AF_DEFAULT_TRACK, current);
+			afSeekFrame(af_fp, AF_DEFAULT_TRACK, frame);
 
 			decoder_command_finished(decoder);
 			cmd = DECODE_COMMAND_NONE;
diff --git a/src/decoder/faad_plugin.c b/src/decoder/faad_plugin.c
index c91f8e8f6..2272963b9 100644
--- a/src/decoder/faad_plugin.c
+++ b/src/decoder/faad_plugin.c
@@ -383,7 +383,6 @@ static void
 faad_stream_decode(struct decoder *mpd_decoder, struct input_stream *is)
 {
 	GError *error = NULL;
-	float file_time;
 	float total_time = 0;
 	faacDecHandle decoder;
 	struct audio_format audio_format;
@@ -434,8 +433,6 @@ faad_stream_decode(struct decoder *mpd_decoder, struct input_stream *is)
 
 	/* the decoder loop */
 
-	file_time = 0.0;
-
 	do {
 		size_t frame_size;
 		const void *decoded;
@@ -481,15 +478,12 @@ faad_stream_decode(struct decoder *mpd_decoder, struct input_stream *is)
 			bit_rate = frame_info.bytesconsumed * 8.0 *
 			    frame_info.channels * audio_format.sample_rate /
 			    frame_info.samples / 1000 + 0.5;
-			file_time +=
-			    (float)(frame_info.samples) / frame_info.channels /
-			    audio_format.sample_rate;
 		}
 
 		/* send PCM samples to MPD */
 
 		cmd = decoder_data(mpd_decoder, is, decoded,
-				   (size_t)frame_info.samples * 2, file_time,
+				   (size_t)frame_info.samples * 2,
 				   bit_rate, NULL);
 	} while (cmd != DECODE_COMMAND_STOP);
 
diff --git a/src/decoder/ffmpeg_plugin.c b/src/decoder/ffmpeg_plugin.c
index 213621b8c..c702500d7 100644
--- a/src/decoder/ffmpeg_plugin.c
+++ b/src/decoder/ffmpeg_plugin.c
@@ -232,7 +232,6 @@ ffmpeg_send_packet(struct decoder *decoder, struct input_stream *is,
 		   const AVRational *time_base)
 {
 	enum decoder_command cmd = DECODE_COMMAND_NONE;
-	int position;
 	uint8_t audio_buf[(AVCODEC_MAX_AUDIO_FRAME_SIZE * 3) / 2 + 16];
 	int16_t *aligned_buffer;
 	size_t buffer_size;
@@ -264,14 +263,13 @@ ffmpeg_send_packet(struct decoder *decoder, struct input_stream *is,
 		if (audio_size <= 0)
 			continue;
 
-		position = packet->pts != (int64_t)AV_NOPTS_VALUE
-			? av_rescale_q(packet->pts, *time_base,
-				       (AVRational){1, 1})
-			: 0;
+		if (packet->pts != (int64_t)AV_NOPTS_VALUE)
+			decoder_timestamp(decoder,
+					  av_rescale_q(packet->pts, *time_base,
+						       (AVRational){1, 1}));
 
 		cmd = decoder_data(decoder, is,
 				   aligned_buffer, audio_size,
-				   position,
 				   codec_context->bit_rate / 1000, NULL);
 	}
 	return cmd;
diff --git a/src/decoder/fluidsynth_plugin.c b/src/decoder/fluidsynth_plugin.c
index 1b1e6a531..2656b5ebd 100644
--- a/src/decoder/fluidsynth_plugin.c
+++ b/src/decoder/fluidsynth_plugin.c
@@ -204,7 +204,7 @@ fluidsynth_file_decode(struct decoder *decoder, const char *path_fs)
 			break;
 
 		cmd = decoder_data(decoder, NULL, buffer, sizeof(buffer),
-				   0, 0, NULL);
+				   0, NULL);
 	} while (cmd == DECODE_COMMAND_NONE);
 
 	/* clean up */
diff --git a/src/decoder/mad_plugin.c b/src/decoder/mad_plugin.c
index 50c9f62bc..f23ab3c21 100644
--- a/src/decoder/mad_plugin.c
+++ b/src/decoder/mad_plugin.c
@@ -1025,7 +1025,6 @@ mp3_send_pcm(struct mp3_data *data, unsigned i, unsigned pcm_length,
 		cmd = decoder_data(data->decoder, data->input_stream,
 				   data->output_buffer,
 				   sizeof(data->output_buffer[0]) * num_samples,
-				   data->elapsed_time,
 				   data->bit_rate / 1000,
 				   replay_gain_info);
 		if (cmd != DECODE_COMMAND_NONE)
diff --git a/src/decoder/mikmod_plugin.c b/src/decoder/mikmod_plugin.c
index 2185fe21c..bbb330cb7 100644
--- a/src/decoder/mikmod_plugin.c
+++ b/src/decoder/mikmod_plugin.c
@@ -147,7 +147,6 @@ mikmod_decoder_file_decode(struct decoder *decoder, const char *path_fs)
 	struct audio_format audio_format;
 	int ret;
 	SBYTE buffer[MIKMOD_FRAME_SIZE];
-	unsigned frame_size, current_frame = 0;
 	enum decoder_command cmd = DECODE_COMMAND_NONE;
 
 	path2 = g_strdup(path_fs);
@@ -167,14 +166,10 @@ mikmod_decoder_file_decode(struct decoder *decoder, const char *path_fs)
 
 	decoder_initialized(decoder, &audio_format, false, 0);
 
-	frame_size = audio_format_frame_size(&audio_format);
-
 	Player_Start(handle);
 	while (cmd == DECODE_COMMAND_NONE && Player_Active()) {
 		ret = VC_WriteBytes(buffer, sizeof(buffer));
-		current_frame += ret / frame_size;
 		cmd = decoder_data(decoder, NULL, buffer, ret,
-				   (float)current_frame / (float)mikmod_sample_rate,
 				   0, NULL);
 	}
 
diff --git a/src/decoder/modplug_plugin.c b/src/decoder/modplug_plugin.c
index df4a99f7f..05c9ef2d7 100644
--- a/src/decoder/modplug_plugin.c
+++ b/src/decoder/modplug_plugin.c
@@ -96,7 +96,6 @@ mod_decode(struct decoder *decoder, struct input_stream *is)
 	struct audio_format audio_format;
 	int ret;
 	char audio_buffer[MODPLUG_FRAME_SIZE];
-	unsigned frame_size, current_frame = 0;
 	enum decoder_command cmd = DECODE_COMMAND_NONE;
 
 	bdatas = mod_loadfile(decoder, is);
@@ -128,24 +127,19 @@ mod_decode(struct decoder *decoder, struct input_stream *is)
 	decoder_initialized(decoder, &audio_format,
 			    is->seekable, ModPlug_GetLength(f) / 1000.0);
 
-	frame_size = audio_format_frame_size(&audio_format);
-
 	do {
 		ret = ModPlug_Read(f, audio_buffer, MODPLUG_FRAME_SIZE);
 		if (ret <= 0)
 			break;
 
-		current_frame += (unsigned)ret / frame_size;
 		cmd = decoder_data(decoder, NULL,
 				   audio_buffer, ret,
-				   (float)current_frame / (float)audio_format.sample_rate,
 				   0, NULL);
 
 		if (cmd == DECODE_COMMAND_SEEK) {
 			float where = decoder_seek_where(decoder);
 
 			ModPlug_Seek(f, (int)(where * 1000.0));
-			current_frame = (unsigned)(where * audio_format.sample_rate);
 
 			decoder_command_finished(decoder);
 		}
diff --git a/src/decoder/mp4ff_plugin.c b/src/decoder/mp4ff_plugin.c
index 9e312d568..325a97291 100644
--- a/src/decoder/mp4ff_plugin.c
+++ b/src/decoder/mp4ff_plugin.c
@@ -262,7 +262,7 @@ mp4_decode(struct decoder *mpd_decoder, struct input_stream *input_stream)
 			dur -= offset;
 		file_time += ((float)dur) / scale;
 
-		if (seeking && file_time > seek_where)
+		if (seeking && file_time >= seek_where)
 			seek_position_found = true;
 
 		if (seeking && seek_position_found) {
@@ -328,7 +328,7 @@ mp4_decode(struct decoder *mpd_decoder, struct input_stream *input_stream)
 
 		cmd = decoder_data(mpd_decoder, input_stream,
 				   sample_buffer, sample_buffer_length,
-				   file_time, bit_rate, NULL);
+				   bit_rate, NULL);
 	}
 
 	g_free(seek_table);
diff --git a/src/decoder/mpcdec_plugin.c b/src/decoder/mpcdec_plugin.c
index bf27ec314..a186bc368 100644
--- a/src/decoder/mpcdec_plugin.c
+++ b/src/decoder/mpcdec_plugin.c
@@ -152,10 +152,8 @@ mpcdec_decode(struct decoder *mpd_decoder, struct input_stream *is)
 	mpc_uint32_t ret;
 	int32_t chunk[G_N_ELEMENTS(sample_buffer)];
 	long bit_rate = 0;
-	unsigned long sample_pos = 0;
 	mpc_uint32_t vbr_update_acc;
 	mpc_uint32_t vbr_update_bits;
-	float total_time;
 	struct replay_gain_info *replay_gain_info = NULL;
 	enum decoder_command cmd = DECODE_COMMAND_NONE;
 
@@ -219,16 +217,14 @@ mpcdec_decode(struct decoder *mpd_decoder, struct input_stream *is)
 
 	do {
 		if (cmd == DECODE_COMMAND_SEEK) {
-			bool success;
-
-			sample_pos = decoder_seek_where(mpd_decoder) *
+			mpc_int64_t where = decoder_seek_where(mpd_decoder) *
 				audio_format.sample_rate;
+			bool success;
 
 #ifdef MPC_IS_OLD_API
-			success = mpc_decoder_seek_sample(&decoder,
-							  sample_pos);
+			success = mpc_decoder_seek_sample(&decoder, where);
 #else
-			success = mpc_demux_seek_sample(demux, sample_pos)
+			success = mpc_demux_seek_sample(demux, where)
 				== MPC_STATUS_OK;
 #endif
 			if (success)
@@ -259,19 +255,15 @@ mpcdec_decode(struct decoder *mpd_decoder, struct input_stream *is)
 		ret = frame.samples;
 #endif
 
-		sample_pos += ret;
-
 		ret *= info.channels;
 
 		mpc_to_mpd_buffer(chunk, sample_buffer, ret);
 
-		total_time = ((float)sample_pos) / audio_format.sample_rate;
 		bit_rate = vbr_update_bits * audio_format.sample_rate
 			/ 1152 / 1000;
 
 		cmd = decoder_data(mpd_decoder, is,
 				   chunk, ret * sizeof(chunk[0]),
-				   total_time,
 				   bit_rate, replay_gain_info);
 	} while (cmd != DECODE_COMMAND_STOP);
 
diff --git a/src/decoder/mpg123_decoder_plugin.c b/src/decoder/mpg123_decoder_plugin.c
index 62e6b00b0..0d7cb9e0e 100644
--- a/src/decoder/mpg123_decoder_plugin.c
+++ b/src/decoder/mpg123_decoder_plugin.c
@@ -103,7 +103,7 @@ mpd_mpg123_file_decode(struct decoder *decoder, const char *path_fs)
 	struct audio_format audio_format;
 	mpg123_handle *handle;
 	int error;
-	off_t num_samples, position;
+	off_t num_samples;
 	enum decoder_command cmd;
 
 	/* open the file */
@@ -134,8 +134,6 @@ mpd_mpg123_file_decode(struct decoder *decoder, const char *path_fs)
 		unsigned char buffer[8192];
 		size_t nbytes;
 
-		position = mpg123_tell(handle);
-
 		/* decode */
 
 		error = mpg123_read(handle, buffer, sizeof(buffer), &nbytes);
@@ -149,8 +147,6 @@ mpd_mpg123_file_decode(struct decoder *decoder, const char *path_fs)
 		/* send to MPD */
 
 		cmd = decoder_data(decoder, NULL, buffer, nbytes,
-				   (float)position /
-				   (float)audio_format.sample_rate,
 				   0, NULL);
 
 		/* seeking not yet implemented */
diff --git a/src/decoder/sidplay_plugin.cxx b/src/decoder/sidplay_plugin.cxx
index 63e46a285..9bfe98f3d 100644
--- a/src/decoder/sidplay_plugin.cxx
+++ b/src/decoder/sidplay_plugin.cxx
@@ -284,7 +284,6 @@ sidplay_file_decode(struct decoder *decoder, const char *path_fs)
 
 	/* .. and play */
 
-	unsigned data_time = 0;
 	const unsigned timebase = player.timebase();
 	song_len *= timebase;
 
@@ -297,12 +296,13 @@ sidplay_file_decode(struct decoder *decoder, const char *path_fs)
 		if (nbytes == 0)
 			break;
 
+		decoder_timestamp(decoder, (double)player.time() / timebase);
+
 		cmd = decoder_data(decoder, NULL, buffer, nbytes,
-				   (float)data_time / (float)timebase,
 				   0, NULL);
-		data_time = player.time();
 
 		if(cmd==DECODE_COMMAND_SEEK) {
+			unsigned data_time = player.time();
 			unsigned target_time = (unsigned)
 				(decoder_seek_where(decoder) * timebase);
 
@@ -323,7 +323,7 @@ sidplay_file_decode(struct decoder *decoder, const char *path_fs)
 			decoder_command_finished(decoder);
 		}
 
-		if (song_len > 0 && data_time >= song_len)
+		if (song_len > 0 && player.time() >= song_len)
 			break;
 
 	} while (cmd != DECODE_COMMAND_STOP);
diff --git a/src/decoder/sndfile_decoder_plugin.c b/src/decoder/sndfile_decoder_plugin.c
index a5fd4243b..fd51f4a33 100644
--- a/src/decoder/sndfile_decoder_plugin.c
+++ b/src/decoder/sndfile_decoder_plugin.c
@@ -119,7 +119,7 @@ sndfile_stream_decode(struct decoder *decoder, struct input_stream *is)
 	SF_INFO info;
 	struct audio_format audio_format;
 	size_t frame_size;
-	sf_count_t read_frames, num_frames, position = 0;
+	sf_count_t read_frames, num_frames;
 	int buffer[4096];
 	enum decoder_command cmd;
 
@@ -155,7 +155,6 @@ sndfile_stream_decode(struct decoder *decoder, struct input_stream *is)
 
 		cmd = decoder_data(decoder, is,
 				   buffer, num_frames * frame_size,
-				   frame_to_time(position, &audio_format),
 				   0, NULL);
 		if (cmd == DECODE_COMMAND_SEEK) {
 			sf_count_t c =
diff --git a/src/decoder/vorbis_plugin.c b/src/decoder/vorbis_plugin.c
index 91a9101f1..f0285de72 100755
--- a/src/decoder/vorbis_plugin.c
+++ b/src/decoder/vorbis_plugin.c
@@ -377,7 +377,6 @@ vorbis_stream_decode(struct decoder *decoder,
 
 		cmd = decoder_data(decoder, input_stream,
 				   chunk, ret,
-				   ov_pcm_tell(&vf) / audio_format.sample_rate,
 				   bitRate, replay_gain_info);
 	} while (cmd != DECODE_COMMAND_STOP);
 
diff --git a/src/decoder/wavpack_plugin.c b/src/decoder/wavpack_plugin.c
index da2c8df77..8b80b1476 100644
--- a/src/decoder/wavpack_plugin.c
+++ b/src/decoder/wavpack_plugin.c
@@ -165,9 +165,8 @@ wavpack_decode(struct decoder *decoder, WavpackContext *wpc, bool can_seek,
 	format_samples_t format_samples;
 	char chunk[CHUNK_SIZE];
 	int samples_requested, samples_got;
-	float total_time, current_time;
+	float total_time;
 	int bytes_per_sample, output_sample_size;
-	int position;
 
 	is_float = (WavpackGetMode(wpc) & MODE_FLOAT) != 0;
 	sample_format =
@@ -199,8 +198,6 @@ wavpack_decode(struct decoder *decoder, WavpackContext *wpc, bool can_seek,
 
 	decoder_initialized(decoder, &audio_format, can_seek, total_time);
 
-	position = 0;
-
 	do {
 		if (decoder_get_command(decoder) == DECODE_COMMAND_SEEK) {
 			if (can_seek) {
@@ -209,7 +206,6 @@ wavpack_decode(struct decoder *decoder, WavpackContext *wpc, bool can_seek,
 				where = decoder_seek_where(decoder);
 				where *= audio_format.sample_rate;
 				if (WavpackSeekSample(wpc, where)) {
-					position = where;
 					decoder_command_finished(decoder);
 				} else {
 					decoder_seek_error(decoder);
@@ -229,9 +225,6 @@ wavpack_decode(struct decoder *decoder, WavpackContext *wpc, bool can_seek,
 		if (samples_got > 0) {
 			int bitrate = (int)(WavpackGetInstantBitrate(wpc) /
 			              1000 + 0.5);
-			position += samples_got;
-			current_time = position;
-			current_time /= audio_format.sample_rate;
 
 			format_samples(
 				bytes_per_sample, chunk,
@@ -241,7 +234,7 @@ wavpack_decode(struct decoder *decoder, WavpackContext *wpc, bool can_seek,
 			decoder_data(
 				decoder, NULL, chunk,
 				samples_got * output_sample_size,
-				current_time, bitrate,
+				bitrate,
 				replay_gain_info
 			);
 		}
diff --git a/src/decoder/wildmidi_plugin.c b/src/decoder/wildmidi_plugin.c
index 70b4d5ef9..0392c06b9 100644
--- a/src/decoder/wildmidi_plugin.c
+++ b/src/decoder/wildmidi_plugin.c
@@ -92,8 +92,6 @@ wildmidi_file_decode(struct decoder *decoder, const char *path_fs)
 			break;
 
 		cmd = decoder_data(decoder, NULL, buffer, len,
-				   (float)info->current_sample /
-				   (float)WILDMIDI_SAMPLE_RATE,
 				   0, NULL);
 
 		if (cmd == DECODE_COMMAND_SEEK) {
diff --git a/src/decoder_api.c b/src/decoder_api.c
index ae2c6687b..dde27727b 100644
--- a/src/decoder_api.c
+++ b/src/decoder_api.c
@@ -95,7 +95,8 @@ enum decoder_command decoder_get_command(G_GNUC_UNUSED struct decoder * decoder)
 	return dc->command;
 }
 
-void decoder_command_finished(G_GNUC_UNUSED struct decoder * decoder)
+void
+decoder_command_finished(struct decoder *decoder)
 {
 	struct decoder_control *dc = decoder->dc;
 
@@ -115,6 +116,8 @@ void decoder_command_finished(G_GNUC_UNUSED struct decoder * decoder)
 		}
 
 		music_pipe_clear(dc->pipe, dc->buffer);
+
+		decoder->timestamp = dc->seek_where;
 	}
 
 	dc->command = DECODE_COMMAND_NONE;
@@ -192,6 +195,15 @@ size_t decoder_read(struct decoder *decoder,
 	}
 }
 
+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.
@@ -250,7 +262,7 @@ enum decoder_command
 decoder_data(struct decoder *decoder,
 	     struct input_stream *is,
 	     const void *_data, size_t length,
-	     float data_time, uint16_t bitRate,
+	     uint16_t kbit_rate,
 	     struct replay_gain_info *replay_gain_info)
 {
 	struct decoder_control *dc = decoder->dc;
@@ -316,7 +328,8 @@ decoder_data(struct decoder *decoder,
 		}
 
 		dest = music_chunk_write(chunk, &dc->out_audio_format,
-					 data_time, bitRate, &nbytes);
+					 decoder->timestamp, kbit_rate,
+					 &nbytes);
 		if (dest == NULL) {
 			/* the chunk is full, flush it */
 			decoder_flush_chunk(decoder);
@@ -350,6 +363,9 @@ decoder_data(struct decoder *decoder,
 
 		data += nbytes;
 		length -= nbytes;
+
+		decoder->timestamp += (double)nbytes /
+			audio_format_time_to_size(&dc->in_audio_format);
 	}
 
 	return DECODE_COMMAND_NONE;
diff --git a/src/decoder_api.h b/src/decoder_api.h
index 81f75623a..9df6bed19 100644
--- a/src/decoder_api.h
+++ b/src/decoder_api.h
@@ -114,6 +114,15 @@ size_t
 decoder_read(struct decoder *decoder, struct input_stream *is,
 	     void *buffer, size_t length);
 
+/**
+ * Sets the time stamp for the next data chunk [seconds].  The MPD
+ * core automatically counts it up, and a decoder plugin only needs to
+ * use this function if it thinks that adding to the time stamp based
+ * on the buffer size won't work.
+ */
+void
+decoder_timestamp(struct decoder *decoder, double t);
+
 /**
  * This function is called by the decoder plugin when it has
  * successfully decoded block of input data.
@@ -129,7 +138,7 @@ decoder_read(struct decoder *decoder, struct input_stream *is,
 enum decoder_command
 decoder_data(struct decoder *decoder, struct input_stream *is,
 	     const void *data, size_t length,
-	     float data_time, uint16_t bitRate,
+	     uint16_t kbit_rate,
 	     struct replay_gain_info *replay_gain_info);
 
 /**
diff --git a/src/decoder_internal.h b/src/decoder_internal.h
index 9d422d253..df558f4dd 100644
--- a/src/decoder_internal.h
+++ b/src/decoder_internal.h
@@ -30,6 +30,11 @@ struct decoder {
 
 	struct pcm_convert_state conv_state;
 
+	/**
+	 * The time stamp of the next data chunk, in seconds.
+	 */
+	double timestamp;
+
 	bool seeking;
 
 	/**
diff --git a/src/decoder_thread.c b/src/decoder_thread.c
index 9f297ad0d..9c6f3aab8 100644
--- a/src/decoder_thread.c
+++ b/src/decoder_thread.c
@@ -303,6 +303,7 @@ decoder_run_song(struct decoder_control *dc,
 	};
 	int ret;
 
+	decoder.timestamp = 0.0;
 	decoder.seeking = false;
 	decoder.song_tag = song->tag != NULL && song_is_file(song)
 		? tag_dup(song->tag) : NULL;
-- 
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