From dac7f181d6d8853ec5caecb3202b4fcc14e45d51 Mon Sep 17 00:00:00 2001
From: Andre Noll <maan@systemlinux.org>
Date: Sun, 7 Aug 2011 12:08:39 +0200
Subject: [PATCH] mp3dec: Kill need_bad_data_delay().

This added quite some complexity for no real gain.
---
 mp3dec_filter.c | 55 ++++---------------------------------------------
 1 file changed, 4 insertions(+), 51 deletions(-)

diff --git a/mp3dec_filter.c b/mp3dec_filter.c
index 7731a379..d262b257 100644
--- a/mp3dec_filter.c
+++ b/mp3dec_filter.c
@@ -24,15 +24,6 @@
 #define MAD_TO_SHORT(f) (f) >= MAD_F_ONE? SHRT_MAX :\
 	(f) <= -MAD_F_ONE? -SHRT_MAX : (signed short) ((f) >> (MAD_F_FRACBITS - 15))
 
-/** State of the decoding process. */
-enum mp3dec_flags {
-	/** Bad main_data_begin pointer encounterd. */
-	MP3DEC_FLAG_BAD_DATA = 1,
-	/** Some output has already been produced. */
-	MP3DEC_FLAG_DECODE_STARTED = 2,
-	MP3DEC_FLAG_NEED_MORE = 4,
-};
-
 /** Data specific to the mp3dec filter. */
 struct private_mp3dec_data {
 	/** Information on the current mp3 stream. */
@@ -41,57 +32,22 @@ struct private_mp3dec_data {
 	struct mad_frame frame;
 	/** Contains the PCM output. */
 	struct mad_synth synth;
-	/** See \ref mp3dec_flags. */
-	unsigned flags;
-	/** Defer decoding until this time. */
-	struct timeval stream_start_barrier;
-	/** Wait until this many input bytes are available. */
-	size_t input_len_barrier;
 	/** The number of channels of the current stream. */
 	unsigned int channels;
 	/** Current sample rate in Hz. */
 	unsigned int sample_rate;
 };
 
-static int need_bad_data_delay(struct private_mp3dec_data *pmd,
-		size_t bytes_available)
-{
-	if (!(pmd->flags & MP3DEC_FLAG_BAD_DATA))
-		return 0;
-	if (pmd->flags & MP3DEC_FLAG_DECODE_STARTED)
-		return 0;
-	if (bytes_available >= pmd->input_len_barrier)
-		return 0;
-	if (tv_diff(now, &pmd->stream_start_barrier, NULL) > 0)
-		return 0;
-	return 1;
-}
-
-/*
- * Returns negative on serious errors, zero if the error should be ignored and
- * positive on bad data pointer errors at stream start.
- */
-static int handle_decode_error(struct private_mp3dec_data *pmd, size_t len)
+/* Returns negative on serious errors. */
+static int handle_decode_error(struct private_mp3dec_data *pmd)
 {
-	const struct timeval delay = {0, 60 * 1000};
 	if (!MAD_RECOVERABLE(pmd->stream.error)
 			&& pmd->stream.error != MAD_ERROR_BUFLEN) {
 		PARA_ERROR_LOG("%s\n", mad_stream_errorstr(&pmd->stream));
 		return -E_MAD_FRAME_DECODE;
 	}
 	PARA_DEBUG_LOG("%s\n", mad_stream_errorstr(&pmd->stream));
-	if (pmd->stream.error != MAD_ERROR_BADDATAPTR)
-		return 0;
-	if (pmd->flags & MP3DEC_FLAG_DECODE_STARTED)
-		return 0;
-	/*
-	 * Bad data pointer at stream start. Defer decoding until the amount of
-	 * data we are about to skip is available again, but wait at most 60ms.
-	 */
-	pmd->flags |= MP3DEC_FLAG_BAD_DATA;
-	pmd->input_len_barrier = len;
-	tv_add(now, &delay, &pmd->stream_start_barrier);
-	return 1;
+	return 0;
 }
 
 static size_t used_mad_buffer_bytes(struct mad_stream *s, size_t max)
@@ -134,8 +90,6 @@ next_buffer:
 	ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
 	if (ret < 0)
 		goto err;
-	if (need_bad_data_delay(pmd, iqs))
-		return;
 	if (ret == 0)
 		return;
 	btr_merge(btrn, fn->min_iqs);
@@ -171,7 +125,7 @@ next_frame:
 	if (ret != 0) {
 		PARA_INFO_LOG("frame decode: %s\n", mad_stream_errorstr(&pmd->stream));
 		used = used_mad_buffer_bytes(&pmd->stream, len);
-		ret = handle_decode_error(pmd, used);
+		ret = handle_decode_error(pmd);
 		btr_consume(btrn, used);
 		if (ret < 0)
 			goto err;
@@ -180,7 +134,6 @@ next_frame:
 		return;
 	}
 	mad_synth_frame(&pmd->synth, &pmd->frame);
-	pmd->flags |= MP3DEC_FLAG_DECODE_STARTED;
 	outbuffer = para_malloc(pmd->synth.pcm.length * 2 * pmd->channels);
 	loaded = 0;
 	for (i = 0; i < pmd->synth.pcm.length; i++) {
-- 
2.39.5