audio encoding reworked

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@15235 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 197 insertions, 0 deletions

diff --git a/libmpcodecs/ae_lavc.c b/libmpcodecs/ae_lavc.c
new file mode 100644
index 0000000000..953de256a1
--- /dev/null
+++ b/libmpcodecs/ae_lavc.c
@@ -0,0 +1,197 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <string.h>
+#include "m_option.h"
+#include "../mp_msg.h"
+#include "aviheader.h"
+#include "ms_hdr.h"
+#include "muxer.h"
+#include "ae_lavc.h"
+#include "help_mp.h"
+#include "../config.h"
+#include "../libaf/af_format.h"
+#ifdef USE_LIBAVCODEC_SO
+#include <ffmpeg/avcodec.h>
+#else
+#include "libavcodec/avcodec.h"
+#endif
+
+static AVCodec        *lavc_acodec;
+static AVCodecContext *lavc_actx;
+extern char *lavc_param_acodec;
+extern int  lavc_param_abitrate;
+extern int  lavc_param_atag;
+extern int  avcodec_inited;
+static int compressed_frame_size = 0;
+
+static int bind_lavc(audio_encoder_t *encoder, muxer_stream_t *mux_a)
+{
+	mux_a->wf = malloc(sizeof(WAVEFORMATEX)+lavc_actx->extradata_size+256);
+	mux_a->wf->wFormatTag = lavc_param_atag;
+	mux_a->wf->nChannels = lavc_actx->channels;
+	mux_a->wf->nSamplesPerSec = lavc_actx->sample_rate;
+	mux_a->wf->nAvgBytesPerSec = (lavc_actx->bit_rate / 8);
+	mux_a->h.dwRate = mux_a->wf->nAvgBytesPerSec;
+	if(lavc_actx->block_align)
+		mux_a->h.dwSampleSize = mux_a->h.dwScale = lavc_actx->block_align;
+	else 
+	{
+		mux_a->h.dwScale = (mux_a->wf->nAvgBytesPerSec * lavc_actx->frame_size)/ mux_a->wf->nSamplesPerSec; /* for cbr */
+	
+		if ((mux_a->wf->nAvgBytesPerSec *
+			lavc_actx->frame_size) % mux_a->wf->nSamplesPerSec) 
+		{
+			mux_a->h.dwScale = lavc_actx->frame_size;
+			mux_a->h.dwRate = lavc_actx->sample_rate;
+			mux_a->h.dwSampleSize = 0; // Blocksize not constant
+		} 
+		else 
+			mux_a->h.dwSampleSize = mux_a->h.dwScale;
+	}
+	mux_a->wf->nBlockAlign = mux_a->h.dwScale;
+	mux_a->h.dwSuggestedBufferSize = (encoder->params.audio_preload*mux_a->wf->nAvgBytesPerSec)/1000;
+	mux_a->h.dwSuggestedBufferSize -= mux_a->h.dwSuggestedBufferSize % mux_a->wf->nBlockAlign;
+
+	switch(lavc_param_atag) 
+	{
+		case 0x11: /* imaadpcm */
+			mux_a->wf->wBitsPerSample = 4;
+			mux_a->wf->cbSize = 2;
+			((uint16_t*)mux_a->wf)[sizeof(WAVEFORMATEX)] = 
+				((lavc_actx->block_align - 4 * lavc_actx->channels) / (4 * lavc_actx->channels)) * 8 + 1;
+			break;
+		case 0x55: /* mp3 */
+			mux_a->wf->cbSize = 12;
+			mux_a->wf->wBitsPerSample = 0; /* does not apply */
+			((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->wID = 1;
+			((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->fdwFlags = 2;
+			((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->nBlockSize = mux_a->wf->nBlockAlign;
+			((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->nFramesPerBlock = 1;
+			((MPEGLAYER3WAVEFORMAT *) (mux_a->wf))->nCodecDelay = 0;
+			break;
+		default:
+			mux_a->wf->wBitsPerSample = 0; /* Unknown */
+			if (lavc_actx->extradata && (lavc_actx->extradata_size > 0))
+			{
+				memcpy(mux_a->wf+sizeof(WAVEFORMATEX), lavc_actx->extradata,
+					lavc_actx->extradata_size);
+				mux_a->wf->cbSize = lavc_actx->extradata_size;
+			}
+			else
+				mux_a->wf->cbSize = 0;
+			break;
+	}
+
+	// Fix allocation    
+	mux_a->wf = realloc(mux_a->wf, sizeof(WAVEFORMATEX)+mux_a->wf->cbSize);
+	
+	encoder->input_format = AF_FORMAT_S16_NE;
+	encoder->min_buffer_size = mux_a->h.dwSuggestedBufferSize;
+	encoder->max_buffer_size = mux_a->h.dwSuggestedBufferSize*2;
+	
+	return 1;
+}
+
+static int encode_lavc(audio_encoder_t *encoder, uint8_t *dest, void *src, int size, int max_size)
+{
+	int n;
+	n = avcodec_encode_audio(lavc_actx, dest, size, src);
+	if(n > compressed_frame_size)
+		compressed_frame_size = n;	//it's valid because lavc encodes in cbr mode
+	return n;
+}
+
+
+static int close_lavc(audio_encoder_t *encoder)
+{
+	compressed_frame_size = 0;
+	return 1;
+}
+
+static int get_frame_size(audio_encoder_t *encoder)
+{
+	return compressed_frame_size;
+}
+
+int mpae_init_lavc(audio_encoder_t *encoder)
+{
+	encoder->params.samples_per_frame = encoder->params.sample_rate;
+	encoder->params.bitrate = encoder->params.sample_rate * encoder->params.channels * 2 * 8;
+	
+	if(!lavc_param_acodec)
+	{
+		mp_msg(MSGT_MENCODER, MSGL_FATAL, MSGTR_NoLavcAudioCodecName);
+		return 0;
+	}
+
+	if(!avcodec_inited){
+		avcodec_init();
+		avcodec_register_all();
+		avcodec_inited=1;
+	}
+
+	lavc_acodec = avcodec_find_encoder_by_name(lavc_param_acodec);
+	if (!lavc_acodec)
+	{
+		mp_msg(MSGT_MENCODER, MSGL_FATAL, MSGTR_LavcAudioCodecNotFound, lavc_param_acodec);
+		return 0;
+	}
+	if(lavc_param_atag == 0)
+	{
+		lavc_param_atag = codec_get_wav_tag(lavc_acodec->id);
+		if(!lavc_param_atag)
+		{
+			mp_msg(MSGT_MENCODER, MSGL_FATAL, "Couldn't find wav tag for specified codec, exit\n");
+			return 0;
+		}
+	}
+
+	lavc_actx = avcodec_alloc_context();
+	if(lavc_actx == NULL)
+	{
+		mp_msg(MSGT_MENCODER, MSGL_FATAL, MSGTR_CouldntAllocateLavcContext);
+		return 0;
+	}
+	
+	// put sample parameters
+	lavc_actx->channels = encoder->params.channels;
+	lavc_actx->sample_rate = encoder->params.sample_rate;
+	lavc_actx->bit_rate = encoder->params.bitrate = lavc_param_abitrate * 1000;
+	
+
+	/*
+	* Special case for adpcm_ima_wav.
+	* The bitrate is only dependant on samplerate.
+	* We have to known frame_size and block_align in advance,
+	* so I just copied the code from libavcodec/adpcm.c
+	*
+	* However, ms adpcm_ima_wav uses a block_align of 2048,
+	* lavc defaults to 1024
+	*/
+	if(lavc_param_atag == 0x11) {
+		int blkalign = 2048;
+		int framesize = (blkalign - 4 * lavc_actx->channels) * 8 / (4 * lavc_actx->channels) + 1;
+		lavc_actx->bit_rate = lavc_actx->sample_rate*8*blkalign/framesize;
+	}
+
+	if(avcodec_open(lavc_actx, lavc_acodec) < 0)
+	{
+		mp_msg(MSGT_MENCODER, MSGL_FATAL, MSGTR_CouldntOpenCodec, lavc_param_acodec, lavc_param_abitrate);
+		return 0;
+	}
+
+	if(lavc_param_atag == 0x11) {
+		lavc_actx->block_align = 2048;
+		lavc_actx->frame_size = (lavc_actx->block_align - 4 * lavc_actx->channels) * 8 / (4 * lavc_actx->channels) + 1;
+	}
+
+	encoder->decode_buffer_size = lavc_actx->frame_size * 2 * encoder->params.channels;
+	encoder->bind = bind_lavc;
+	encoder->get_frame_size = get_frame_size;
+	encoder->encode = encode_lavc;
+	encoder->close = close_lavc;
+
+	return 1;
+}
+