/* * Copyright (c) 2002 Mark Hills * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include #include "avcodec.h" #include "bytestream.h" #include "internal.h" typedef struct OggVorbisDecContext { vorbis_info vi; /**< vorbis_info used during init */ vorbis_dsp_state vd; /**< DSP state used for analysis */ vorbis_block vb; /**< vorbis_block used for analysis */ vorbis_comment vc; /**< VorbisComment info */ ogg_packet op; /**< ogg packet */ } OggVorbisDecContext; static int oggvorbis_decode_close(AVCodecContext *avccontext); static int oggvorbis_decode_init(AVCodecContext *avccontext) { OggVorbisDecContext *context = avccontext->priv_data ; uint8_t *p= avccontext->extradata; int i, hsizes[3], ret; unsigned char *headers[3], *extradata = avccontext->extradata; if(! avccontext->extradata_size || ! p) { av_log(avccontext, AV_LOG_ERROR, "vorbis extradata absent\n"); return AVERROR(EINVAL); } vorbis_info_init(&context->vi) ; vorbis_comment_init(&context->vc) ; if(p[0] == 0 && p[1] == 30) { int sizesum = 0; for(i = 0; i < 3; i++){ hsizes[i] = bytestream_get_be16((const uint8_t **)&p); sizesum += 2 + hsizes[i]; if (sizesum > avccontext->extradata_size) { av_log(avccontext, AV_LOG_ERROR, "vorbis extradata too small\n"); ret = AVERROR_INVALIDDATA; goto error; } headers[i] = p; p += hsizes[i]; } } else if(*p == 2) { unsigned int offset = 1; unsigned int sizesum = 1; p++; for(i=0; i<2; i++) { hsizes[i] = 0; while((*p == 0xFF) && (sizesum < avccontext->extradata_size)) { hsizes[i] += 0xFF; offset++; sizesum += 1 + 0xFF; p++; } hsizes[i] += *p; offset++; sizesum += 1 + *p; if(sizesum > avccontext->extradata_size) { av_log(avccontext, AV_LOG_ERROR, "vorbis header sizes damaged\n"); ret = AVERROR_INVALIDDATA; goto error; } p++; } hsizes[2] = avccontext->extradata_size - hsizes[0]-hsizes[1]-offset; #if 0 av_log(avccontext, AV_LOG_DEBUG, "vorbis header sizes: %d, %d, %d, / extradata_len is %d \n", hsizes[0], hsizes[1], hsizes[2], avccontext->extradata_size); #endif headers[0] = extradata + offset; headers[1] = extradata + offset + hsizes[0]; headers[2] = extradata + offset + hsizes[0] + hsizes[1]; } else { av_log(avccontext, AV_LOG_ERROR, "vorbis initial header len is wrong: %d\n", *p); ret = AVERROR_INVALIDDATA; goto error; } for(i=0; i<3; i++){ context->op.b_o_s= i==0; context->op.bytes = hsizes[i]; context->op.packet = headers[i]; if(vorbis_synthesis_headerin(&context->vi, &context->vc, &context->op)<0){ av_log(avccontext, AV_LOG_ERROR, "%d. vorbis header damaged\n", i+1); ret = AVERROR_INVALIDDATA; goto error; } } avccontext->channels = context->vi.channels; avccontext->sample_rate = context->vi.rate; avccontext->sample_fmt = AV_SAMPLE_FMT_S16; avccontext->time_base= (AVRational){1, avccontext->sample_rate}; vorbis_synthesis_init(&context->vd, &context->vi); vorbis_block_init(&context->vd, &context->vb); return 0 ; error: oggvorbis_decode_close(avccontext); return ret; } static inline int conv(int samples, float **pcm, char *buf, int channels) { int i, j; ogg_int16_t *ptr, *data = (ogg_int16_t*)buf ; float *mono ; for(i = 0 ; i < channels ; i++){ ptr = &data[i]; mono = pcm[i] ; for(j = 0 ; j < samples ; j++) { *ptr = av_clip_int16(mono[j] * 32767.f); ptr += channels; } } return 0 ; } static int oggvorbis_decode_frame(AVCodecContext *avccontext, void *data, int *got_frame_ptr, AVPacket *avpkt) { OggVorbisDecContext *context = avccontext->priv_data ; AVFrame *frame = data; float **pcm ; ogg_packet *op= &context->op; int samples, total_samples, total_bytes; int ret; int16_t *output; if(!avpkt->size){ //FIXME flush return 0; } frame->nb_samples = 8192*4; if ((ret = ff_get_buffer(avccontext, frame, 0)) < 0) return ret; output = (int16_t *)frame->data[0]; op->packet = avpkt->data; op->bytes = avpkt->size; // av_log(avccontext, AV_LOG_DEBUG, "%d %d %d %"PRId64" %"PRId64" %d %d\n", op->bytes, op->b_o_s, op->e_o_s, op->granulepos, op->packetno, buf_size, context->vi.rate); /* for(i=0; ibytes; i++) av_log(avccontext, AV_LOG_DEBUG, "%02X ", op->packet[i]); av_log(avccontext, AV_LOG_DEBUG, "\n");*/ if(vorbis_synthesis(&context->vb, op) == 0) vorbis_synthesis_blockin(&context->vd, &context->vb) ; total_samples = 0 ; total_bytes = 0 ; while((samples = vorbis_synthesis_pcmout(&context->vd, &pcm)) > 0) { conv(samples, pcm, (char*)output + total_bytes, context->vi.channels) ; total_bytes += samples * 2 * context->vi.channels ; total_samples += samples ; vorbis_synthesis_read(&context->vd, samples) ; } frame->nb_samples = total_samples; *got_frame_ptr = total_samples > 0; return avpkt->size; } static int oggvorbis_decode_close(AVCodecContext *avccontext) { OggVorbisDecContext *context = avccontext->priv_data ; vorbis_block_clear(&context->vb); vorbis_dsp_clear(&context->vd); vorbis_info_clear(&context->vi) ; vorbis_comment_clear(&context->vc) ; return 0 ; } AVCodec ff_libvorbis_decoder = { .name = "libvorbis", .long_name = NULL_IF_CONFIG_SMALL("libvorbis"), .type = AVMEDIA_TYPE_AUDIO, .id = AV_CODEC_ID_VORBIS, .priv_data_size = sizeof(OggVorbisDecContext), .init = oggvorbis_decode_init, .decode = oggvorbis_decode_frame, .close = oggvorbis_decode_close, .capabilities = AV_CODEC_CAP_DELAY, };