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 "libmpdemux/aviheader.h"
  10 #include "libaf/af_format.h"
  11 #include "libaf/reorder_ch.h"
  12 #include "libmpdemux/ms_hdr.h"
  13 #include "stream/stream.h"
  14 #include "libmpdemux/muxer.h"
  15 #include "ae_pcm.h"
  16
  17
  18 static int bind_pcm(audio_encoder_t *encoder, muxer_stream_t *mux_a)
  19 {
  20         mux_a->h.dwScale=1;
  21         mux_a->h.dwRate=encoder->params.sample_rate;
  22         mux_a->wf=malloc(sizeof(WAVEFORMATEX));
  23         mux_a->wf->wFormatTag=0x1; // PCM
  24         mux_a->wf->nChannels=encoder->params.channels;
  25         mux_a->h.dwSampleSize=2*mux_a->wf->nChannels;
  26         mux_a->wf->nBlockAlign=mux_a->h.dwSampleSize;
  27         mux_a->wf->nSamplesPerSec=mux_a->h.dwRate;
  28         mux_a->wf->nAvgBytesPerSec=mux_a->h.dwSampleSize*mux_a->wf->nSamplesPerSec;
  29         mux_a->wf->wBitsPerSample=16;
  30         mux_a->wf->cbSize=0; // FIXME for l3codeca.acm
  31
  32         encoder->input_format = (mux_a->wf->wBitsPerSample==8) ? AF_FORMAT_U8 : AF_FORMAT_S16_LE;
  33         encoder->min_buffer_size = 16384;
  34         encoder->max_buffer_size = mux_a->wf->nAvgBytesPerSec;
  35
  36         return 1;
  37 }
  38
  39 static int encode_pcm(audio_encoder_t *encoder, uint8_t *dest, void *src, int nsamples, int max_size)
  40 {
  41         max_size = FFMIN(nsamples, max_size);
  42         if (encoder->params.channels == 6 || encoder->params.channels == 5) {
  43                 max_size -= max_size % (encoder->params.channels * 2);
  44                 reorder_channel_copy_nch(src, AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
  45                                          dest, AF_CHANNEL_LAYOUT_WAVEEX_DEFAULT,
  46                                          encoder->params.channels,
  47                                          max_size / 2, 2);
  48         }
  49         else
  50         memcpy(dest, src, max_size);
  51         return max_size;
  52 }
  53
  54 static int set_decoded_len(audio_encoder_t *encoder, int len)
  55 {
  56         return len;
  57 }
  58
  59 static int close_pcm(audio_encoder_t *encoder)
  60 {
  61         return 1;
  62 }
  63
  64 static int get_frame_size(audio_encoder_t *encoder)
  65 {
  66         return 0;
  67 }
  68
  69 int mpae_init_pcm(audio_encoder_t *encoder)
  70 {
  71         encoder->params.samples_per_frame = encoder->params.sample_rate;
  72         encoder->params.bitrate = encoder->params.sample_rate * encoder->params.channels * 2 * 8;
  73
  74         encoder->decode_buffer_size = encoder->params.bitrate / 8;
  75         encoder->bind = bind_pcm;
  76         encoder->get_frame_size = get_frame_size;
  77         encoder->set_decoded_len = set_decoded_len;
  78         encoder->encode = encode_pcm;
  79         encoder->close = close_pcm;
  80
  81         return 1;
  82 }
  83