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00027 #include "libavutil/audioconvert.h"
00028 #include "avcodec.h"
00029 #include "bytestream.h"
00030
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00052 static int pcm_bluray_parse_header(AVCodecContext *avctx,
00053 const uint8_t *header)
00054 {
00055 static const uint8_t bits_per_samples[4] = { 0, 16, 20, 24 };
00056 static const uint32_t channel_layouts[16] = {
00057 0, AV_CH_LAYOUT_MONO, 0, AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_SURROUND,
00058 AV_CH_LAYOUT_2_1, AV_CH_LAYOUT_4POINT0, AV_CH_LAYOUT_2_2, AV_CH_LAYOUT_5POINT0,
00059 AV_CH_LAYOUT_5POINT1, AV_CH_LAYOUT_7POINT0, AV_CH_LAYOUT_7POINT1, 0, 0, 0, 0
00060 };
00061 static const uint8_t channels[16] = {
00062 0, 1, 0, 2, 3, 3, 4, 4, 5, 6, 7, 8, 0, 0, 0, 0
00063 };
00064 uint8_t channel_layout = header[2] >> 4;
00065
00066 if (avctx->debug & FF_DEBUG_PICT_INFO)
00067 av_dlog(avctx, "pcm_bluray_parse_header: header = %02x%02x%02x%02x\n",
00068 header[0], header[1], header[2], header[3]);
00069
00070
00071 avctx->bits_per_coded_sample = bits_per_samples[header[3] >> 6];
00072 if (!avctx->bits_per_coded_sample) {
00073 av_log(avctx, AV_LOG_ERROR, "unsupported sample depth (0)\n");
00074 return -1;
00075 }
00076 avctx->sample_fmt = avctx->bits_per_coded_sample == 16 ? AV_SAMPLE_FMT_S16 :
00077 AV_SAMPLE_FMT_S32;
00078
00079
00080 switch (header[2] & 0x0f) {
00081 case 1:
00082 avctx->sample_rate = 48000;
00083 break;
00084 case 4:
00085 avctx->sample_rate = 96000;
00086 break;
00087 case 5:
00088 avctx->sample_rate = 192000;
00089 break;
00090 default:
00091 avctx->sample_rate = 0;
00092 av_log(avctx, AV_LOG_ERROR, "unsupported sample rate (%d)\n",
00093 header[2] & 0x0f);
00094 return -1;
00095 }
00096
00097
00098
00099
00100
00101
00102
00103 avctx->channel_layout = channel_layouts[channel_layout];
00104 avctx->channels = channels[channel_layout];
00105 if (!avctx->channels) {
00106 av_log(avctx, AV_LOG_ERROR, "unsupported channel configuration (%d)\n",
00107 channel_layout);
00108 return -1;
00109 }
00110
00111 avctx->bit_rate = avctx->channels * avctx->sample_rate *
00112 avctx->bits_per_coded_sample;
00113
00114 if (avctx->debug & FF_DEBUG_PICT_INFO)
00115 av_dlog(avctx,
00116 "pcm_bluray_parse_header: %d channels, %d bits per sample, %d kHz, %d kbit\n",
00117 avctx->channels, avctx->bits_per_coded_sample,
00118 avctx->sample_rate, avctx->bit_rate);
00119 return 0;
00120 }
00121
00122 typedef struct PCMBRDecode {
00123 AVFrame frame;
00124 } PCMBRDecode;
00125
00126 static av_cold int pcm_bluray_decode_init(AVCodecContext * avctx)
00127 {
00128 PCMBRDecode *s = avctx->priv_data;
00129
00130 avcodec_get_frame_defaults(&s->frame);
00131 avctx->coded_frame = &s->frame;
00132
00133 return 0;
00134 }
00135
00136 static int pcm_bluray_decode_frame(AVCodecContext *avctx, void *data,
00137 int *got_frame_ptr, AVPacket *avpkt)
00138 {
00139 const uint8_t *src = avpkt->data;
00140 int buf_size = avpkt->size;
00141 PCMBRDecode *s = avctx->priv_data;
00142 int num_source_channels, channel, retval;
00143 int sample_size, samples;
00144 int16_t *dst16;
00145 int32_t *dst32;
00146
00147 if (buf_size < 4) {
00148 av_log(avctx, AV_LOG_ERROR, "PCM packet too small\n");
00149 return -1;
00150 }
00151
00152 if (pcm_bluray_parse_header(avctx, src))
00153 return -1;
00154 src += 4;
00155 buf_size -= 4;
00156
00157
00158 num_source_channels = FFALIGN(avctx->channels, 2);
00159 sample_size = (num_source_channels * (avctx->sample_fmt == AV_SAMPLE_FMT_S16 ? 16 : 24)) >> 3;
00160 samples = buf_size / sample_size;
00161
00162
00163 s->frame.nb_samples = samples;
00164 if ((retval = avctx->get_buffer(avctx, &s->frame)) < 0) {
00165 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00166 return retval;
00167 }
00168 dst16 = (int16_t *)s->frame.data[0];
00169 dst32 = (int32_t *)s->frame.data[0];
00170
00171 if (samples) {
00172 switch (avctx->channel_layout) {
00173
00174 case AV_CH_LAYOUT_STEREO:
00175 case AV_CH_LAYOUT_4POINT0:
00176 case AV_CH_LAYOUT_2_2:
00177 samples *= num_source_channels;
00178 if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
00179 #if HAVE_BIGENDIAN
00180 memcpy(dst16, src, buf_size);
00181 #else
00182 do {
00183 *dst16++ = bytestream_get_be16(&src);
00184 } while (--samples);
00185 #endif
00186 } else {
00187 do {
00188 *dst32++ = bytestream_get_be24(&src) << 8;
00189 } while (--samples);
00190 }
00191 break;
00192
00193 case AV_CH_LAYOUT_MONO:
00194 case AV_CH_LAYOUT_SURROUND:
00195 case AV_CH_LAYOUT_2_1:
00196 case AV_CH_LAYOUT_5POINT0:
00197 if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
00198 do {
00199 #if HAVE_BIGENDIAN
00200 memcpy(dst16, src, avctx->channels * 2);
00201 dst16 += avctx->channels;
00202 src += sample_size;
00203 #else
00204 channel = avctx->channels;
00205 do {
00206 *dst16++ = bytestream_get_be16(&src);
00207 } while (--channel);
00208 src += 2;
00209 #endif
00210 } while (--samples);
00211 } else {
00212 do {
00213 channel = avctx->channels;
00214 do {
00215 *dst32++ = bytestream_get_be24(&src) << 8;
00216 } while (--channel);
00217 src += 3;
00218 } while (--samples);
00219 }
00220 break;
00221
00222 case AV_CH_LAYOUT_5POINT1:
00223 if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
00224 do {
00225 dst16[0] = bytestream_get_be16(&src);
00226 dst16[1] = bytestream_get_be16(&src);
00227 dst16[2] = bytestream_get_be16(&src);
00228 dst16[4] = bytestream_get_be16(&src);
00229 dst16[5] = bytestream_get_be16(&src);
00230 dst16[3] = bytestream_get_be16(&src);
00231 dst16 += 6;
00232 } while (--samples);
00233 } else {
00234 do {
00235 dst32[0] = bytestream_get_be24(&src) << 8;
00236 dst32[1] = bytestream_get_be24(&src) << 8;
00237 dst32[2] = bytestream_get_be24(&src) << 8;
00238 dst32[4] = bytestream_get_be24(&src) << 8;
00239 dst32[5] = bytestream_get_be24(&src) << 8;
00240 dst32[3] = bytestream_get_be24(&src) << 8;
00241 dst32 += 6;
00242 } while (--samples);
00243 }
00244 break;
00245
00246 case AV_CH_LAYOUT_7POINT0:
00247 if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
00248 do {
00249 dst16[0] = bytestream_get_be16(&src);
00250 dst16[1] = bytestream_get_be16(&src);
00251 dst16[2] = bytestream_get_be16(&src);
00252 dst16[5] = bytestream_get_be16(&src);
00253 dst16[3] = bytestream_get_be16(&src);
00254 dst16[4] = bytestream_get_be16(&src);
00255 dst16[6] = bytestream_get_be16(&src);
00256 dst16 += 7;
00257 src += 2;
00258 } while (--samples);
00259 } else {
00260 do {
00261 dst32[0] = bytestream_get_be24(&src) << 8;
00262 dst32[1] = bytestream_get_be24(&src) << 8;
00263 dst32[2] = bytestream_get_be24(&src) << 8;
00264 dst32[5] = bytestream_get_be24(&src) << 8;
00265 dst32[3] = bytestream_get_be24(&src) << 8;
00266 dst32[4] = bytestream_get_be24(&src) << 8;
00267 dst32[6] = bytestream_get_be24(&src) << 8;
00268 dst32 += 7;
00269 src += 3;
00270 } while (--samples);
00271 }
00272 break;
00273
00274 case AV_CH_LAYOUT_7POINT1:
00275 if (AV_SAMPLE_FMT_S16 == avctx->sample_fmt) {
00276 do {
00277 dst16[0] = bytestream_get_be16(&src);
00278 dst16[1] = bytestream_get_be16(&src);
00279 dst16[2] = bytestream_get_be16(&src);
00280 dst16[6] = bytestream_get_be16(&src);
00281 dst16[4] = bytestream_get_be16(&src);
00282 dst16[5] = bytestream_get_be16(&src);
00283 dst16[7] = bytestream_get_be16(&src);
00284 dst16[3] = bytestream_get_be16(&src);
00285 dst16 += 8;
00286 } while (--samples);
00287 } else {
00288 do {
00289 dst32[0] = bytestream_get_be24(&src) << 8;
00290 dst32[1] = bytestream_get_be24(&src) << 8;
00291 dst32[2] = bytestream_get_be24(&src) << 8;
00292 dst32[6] = bytestream_get_be24(&src) << 8;
00293 dst32[4] = bytestream_get_be24(&src) << 8;
00294 dst32[5] = bytestream_get_be24(&src) << 8;
00295 dst32[7] = bytestream_get_be24(&src) << 8;
00296 dst32[3] = bytestream_get_be24(&src) << 8;
00297 dst32 += 8;
00298 } while (--samples);
00299 }
00300 break;
00301 }
00302 }
00303
00304 *got_frame_ptr = 1;
00305 *(AVFrame *)data = s->frame;
00306
00307 retval = src - avpkt->data;
00308 if (avctx->debug & FF_DEBUG_BITSTREAM)
00309 av_dlog(avctx, "pcm_bluray_decode_frame: decoded %d -> %d bytes\n",
00310 retval, buf_size);
00311 return retval;
00312 }
00313
00314 AVCodec ff_pcm_bluray_decoder = {
00315 .name = "pcm_bluray",
00316 .type = AVMEDIA_TYPE_AUDIO,
00317 .id = CODEC_ID_PCM_BLURAY,
00318 .priv_data_size = sizeof(PCMBRDecode),
00319 .init = pcm_bluray_decode_init,
00320 .decode = pcm_bluray_decode_frame,
00321 .capabilities = CODEC_CAP_DR1,
00322 .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32,
00323 AV_SAMPLE_FMT_NONE},
00324 .long_name = NULL_IF_CONFIG_SMALL("PCM signed 16|20|24-bit big-endian for Blu-ray media"),
00325 };