libmpcodecs/ae_pcm.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <inttypes.h>
   4 #include <unistd.h>
   5 #include <string.h>
   6 #include <sys/types.h>
   7 #include "m_option.h"
   8 #include "mp_msg.h"
   9 #include "aviheader.h"
  10 #include "libaf/af_format.h"
  11 #include "ms_hdr.h"
  12 #include "muxer.h"
  13 #include "ae_pcm.h"
  14
  15
  16 static int bind_pcm(audio_encoder_t *encoder, muxer_stream_t *mux_a)
  17 {
  18         mux_a->h.dwScale=1;
  19         mux_a->h.dwRate=encoder->params.sample_rate;
  20         mux_a->wf=malloc(sizeof(WAVEFORMATEX));
  21         mux_a->wf->wFormatTag=0x1; // PCM
  22         mux_a->wf->nChannels=encoder->params.channels;
  23         mux_a->h.dwSampleSize=2*mux_a->wf->nChannels;
  24         mux_a->wf->nBlockAlign=mux_a->h.dwSampleSize;
  25         mux_a->wf->nSamplesPerSec=mux_a->h.dwRate;
  26         mux_a->wf->nAvgBytesPerSec=mux_a->h.dwSampleSize*mux_a->wf->nSamplesPerSec;
  27         mux_a->wf->wBitsPerSample=16;
  28         mux_a->wf->cbSize=0; // FIXME for l3codeca.acm
  29
  30         encoder->input_format = (mux_a->wf->wBitsPerSample==8) ? AF_FORMAT_U8 : AF_FORMAT_S16_LE;
  31         encoder->min_buffer_size = 16384;
  32         encoder->max_buffer_size = mux_a->wf->nAvgBytesPerSec;
  33
  34         return 1;
  35 }
  36
  37 static int encode_pcm(audio_encoder_t *encoder, uint8_t *dest, void *src, int nsamples, int max_size)
  38 {
  39         max_size = min(nsamples, max_size);
  40         memcpy(dest, src, max_size);
  41         return max_size;
  42 }
  43
  44 static int set_decoded_len(audio_encoder_t *encoder, int len)
  45 {
  46         return len;
  47 }
  48
  49 static int close_pcm(audio_encoder_t *encoder)
  50 {
  51         return 1;
  52 }
  53
  54 static int get_frame_size(audio_encoder_t *encoder)
  55 {
  56         return 0;
  57 }
  58
  59 int mpae_init_pcm(audio_encoder_t *encoder)
  60 {
  61         encoder->params.samples_per_frame = encoder->params.sample_rate;
  62         encoder->params.bitrate = encoder->params.sample_rate * encoder->params.channels * 2 * 8;
  63
  64         encoder->decode_buffer_size = encoder->params.bitrate / 8;
  65         encoder->bind = bind_pcm;
  66         encoder->get_frame_size = get_frame_size;
  67         encoder->set_decoded_len = set_decoded_len;
  68         encoder->encode = encode_pcm;
  69         encoder->close = close_pcm;
  70
  71         return 1;
  72 }
  73