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/*
* audio_trans.c - audio frame transformation routines
* Written by Andrew Church <achurch@achurch.org>
*
* This file is part of transcode, a video stream processing tool.
* transcode is free software, distributable under the terms of the GNU
* General Public License (version 2 or later). See the file COPYING
* for details.
*/
#include "transcode.h"
#include "framebuffer.h"
#include "audio_trans.h"
#include "libtcaudio/tcaudio.h"
/*************************************************************************/
/* Handle for calling tcaudio functions. */
static TCAHandle handle = 0;
/*************************************************************************/
/*************************************************************************/
/**
* do_process_audio: Perform actual audio processing.
*
* Parameters:
* vob: Global data pointer.
* ptr: Pointer to audio frame buffer.
* Return value:
* 1 on success, 0 on failure.
*/
static int do_process_audio(vob_t *vob, aframe_list_t *ptr)
{
int srcfmt, nsamples;
/* First convert audio to destination format (also handles -d) */
if (vob->a_bits == 8) {
srcfmt = TCA_U8;
nsamples = ptr->audio_size;
} else if (vob->a_bits == 16) {
srcfmt = pcmswap ? TCA_S16BE : TCA_S16LE;
nsamples = ptr->audio_size / 2;
} else {
tc_log_error(__FILE__, "Sorry, source audio format not supported");
return 0;
}
tca_convert_from(handle, ptr->audio_buf, nsamples, srcfmt);
/* Convert between stereo and mono */
if (vob->a_chan == 1 && vob->dm_chan == 2) {
tca_mono_to_stereo(handle, ptr->audio_buf, nsamples);
nsamples *= 2;
} else if (vob->a_chan == 2 && vob->dm_chan == 1) {
nsamples /= 2;
tca_stereo_to_mono(handle, ptr->audio_buf, nsamples);
}
/* Update audio buffer size */
ptr->audio_size = nsamples * (vob->dm_bits/8);
/* -s: Amplify volume */
if (vob->volume > 0) {
int nclip = 0;
tca_amplify(handle, ptr->audio_buf, nsamples, vob->volume, &nclip);
vob->clip_count += nclip;
}
/* --av_fine_ms: Shift audio */
if (vob->sync_ms != 0) {
/* This is the first time here: convert time (ms) to samples.
* Note that we adjust based on the source rate */
vob->sync_samples = (vob->sync_ms * vob->a_rate / 1000) * vob->dm_chan;
if (verbose & TC_DEBUG) {
if (vob->sync_samples < 0) {
tc_log_info(__FILE__, "inserting %d PCM samples (%d ms)",
-vob->sync_samples, -vob->sync_ms);
} else {
tc_log_info(__FILE__, "deleting %d PCM samples (%d ms)",
vob->sync_samples, vob->sync_ms);
}
}
vob->sync_ms = 0; // Clear it so we don't come here again
}
if (vob->sync_samples < 0) {
int new_samples = -vob->sync_samples;
int new_bytes = new_samples * (vob->dm_bits/8);
memmove((uint8_t *)ptr->audio_buf + new_bytes, ptr->audio_buf,
ptr->audio_size);
memset(ptr->audio_buf, 0, new_bytes);
nsamples += new_samples;
ptr->audio_size += new_bytes;
vob->sync_samples = 0;
} else if (vob->sync_samples > 0) {
int del_samples = vob->sync_samples;
if (del_samples >= nsamples) {
del_samples = nsamples;
nsamples = 0;
ptr->audio_size = 0;
} else {
int del_bytes = del_samples * (vob->dm_bits/8);
memmove(ptr->audio_buf, (uint8_t *)ptr->audio_buf + del_bytes,
ptr->audio_size - del_bytes);
nsamples -= del_samples;
ptr->audio_size -= del_bytes;
}
vob->sync_samples -= del_samples;
}
/* All done */
return 1;
}
/*************************************************************************/
/**
* process_aud_frame: Main audio frame processing routine.
*
* Parameters:
* vob: Global data pointer.
* ptr: Pointer to audio frame buffer.
* Return value:
* 0 on success, -1 on failure.
*/
int process_aud_frame(vob_t *vob, aframe_list_t *ptr)
{
/* Check parameter validity */
if (!vob || !ptr)
return -1;
/* Allocate tcaudio handle if necessary */
if (!handle) {
AudioFormat format;
if (vob->dm_bits == 8) {
format = TCA_U8;
} else if (vob->dm_bits == 16) {
format = TCA_S16LE;
} else {
tc_log_error(__FILE__, "Sorry, output audio format not supported");
return -1;
}
handle = tca_init(format);
if (!handle) {
tc_log_error(__FILE__, "tca_init() failed!");
return -1;
}
}
/* Check for pass-through mode */
if (vob->pass_flag & TC_AUDIO)
return 0;
/* Check audio format */
if (vob->im_a_codec != CODEC_PCM) {
tc_log_error(__FILE__,
"Sorry, only PCM audio is supported for processing");
return -1;
}
/* Actually perform processing */
return do_process_audio(vob, ptr) ? 0 : -1;
}
/*************************************************************************/
/*
* Local variables:
* c-file-style: "stroustrup"
* c-file-offsets: ((case-label . *) (statement-case-intro . *))
* indent-tabs-mode: nil
* End:
*
* vim: expandtab shiftwidth=4:
*/
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