105     AVCodecParameters *par;  in apm_read_header()  local
118     par = st->codecpar;  in apm_read_header()
119     par->channels              = avio_rl16(s->pb);  in apm_read_header()
120     par->sample_rate           = avio_rl32(s->pb);  in apm_read_header()
126     par->block_align           = avio_rl16(s->pb);  in apm_read_header()
127     par->bits_per_coded_sample = avio_rl16(s->pb);  in apm_read_header()
133     if (par->sample_rate > (INT_MAX / 8))  in apm_read_header()
136     if (par->bits_per_coded_sample != 4)  in apm_read_header()
139     if (par->channels == 2)  in apm_read_header()
140         par->channel_layout    = AV_CH_LAYOUT_STEREO;  in apm_read_header()
141     else if (par->channels == 1)  in apm_read_header()
142         par->channel_layout    = AV_CH_LAYOUT_MONO;  in apm_read_header()
146     par->codec_type            = AVMEDIA_TYPE_AUDIO;  in apm_read_header()
147     par->codec_id              = AV_CODEC_ID_ADPCM_IMA_APM;  in apm_read_header()
148     par->format                = AV_SAMPLE_FMT_S16;  in apm_read_header()
149     par->bits_per_raw_sample   = 16;  in apm_read_header()
150     par->bit_rate              = par->channels *  in apm_read_header()
151                                  par->sample_rate *  in apm_read_header()
152                                  par->bits_per_coded_sample;  in apm_read_header()
169     if ((ret = ff_alloc_extradata(par, APM_EXTRADATA_SIZE)) < 0)  in apm_read_header()
173     memcpy(par->extradata, buf + 20, APM_EXTRADATA_SIZE);  in apm_read_header()
175     avpriv_set_pts_info(st, 64, 1, par->sample_rate);  in apm_read_header()
178                       (8 / par->bits_per_coded_sample) /  in apm_read_header()
179                       par->channels;  in apm_read_header()
186     AVCodecParameters *par = s->streams[0]->codecpar;  in apm_read_packet()  local
199     pkt->duration       = ret * (8 / par->bits_per_coded_sample) / par->channels;  in apm_read_packet()
216     AVCodecParameters *par;  in apm_write_init()  local
223     par = s->streams[0]->codecpar;  in apm_write_init()
225     if (par->codec_id != AV_CODEC_ID_ADPCM_IMA_APM) {  in apm_write_init()
227                avcodec_get_name(par->codec_id));  in apm_write_init()
231     if (par->channels > 2) {  in apm_write_init()
236     if (par->sample_rate > (INT_MAX / 8)) {  in apm_write_init()
241     if (par->extradata_size != APM_EXTRADATA_SIZE) {  in apm_write_init()
257     AVCodecParameters *par = s->streams[0]->codecpar;  in apm_write_header()  local
264     avio_wl16(s->pb, par->channels);  in apm_write_header()
265     avio_wl32(s->pb, par->sample_rate);  in apm_write_header()
267     avio_wl32(s->pb, par->sample_rate * par->channels * 2);  in apm_write_header()
268     avio_wl16(s->pb, par->block_align);  in apm_write_header()
269     avio_wl16(s->pb, par->bits_per_coded_sample);  in apm_write_header()
278     memcpy( buf + 20, par->extradata, APM_EXTRADATA_SIZE);  in apm_write_header()