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-rw-r--r--media/ffvpx/libavcodec/libvorbisdec.c224
1 files changed, 224 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/libvorbisdec.c b/media/ffvpx/libavcodec/libvorbisdec.c
new file mode 100644
index 0000000000..a5e7a691d6
--- /dev/null
+++ b/media/ffvpx/libavcodec/libvorbisdec.c
@@ -0,0 +1,224 @@
+/*
+ * Copyright (c) 2002 Mark Hills <mark@pogo.org.uk>
+ *
+ * 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 <vorbis/vorbisenc.h>
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "codec_internal.h"
+#include "decode.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;
+ }
+ }
+
+ av_channel_layout_uninit(&avccontext->ch_layout);
+ avccontext->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
+ avccontext->ch_layout.nb_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, AVFrame *frame,
+ int *got_frame_ptr, AVPacket *avpkt)
+{
+ OggVorbisDecContext *context = avccontext->priv_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; i<op->bytes; 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 ;
+}
+
+
+const FFCodec ff_libvorbis_decoder = {
+ .p.name = "libvorbis",
+ CODEC_LONG_NAME("libvorbis"),
+ .p.type = AVMEDIA_TYPE_AUDIO,
+ .p.id = AV_CODEC_ID_VORBIS,
+ .p.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_CHANNEL_CONF,
+ .caps_internal = FF_CODEC_CAP_NOT_INIT_THREADSAFE,
+ .priv_data_size = sizeof(OggVorbisDecContext),
+ .init = oggvorbis_decode_init,
+ FF_CODEC_DECODE_CB(oggvorbis_decode_frame),
+ .close = oggvorbis_decode_close,
+};
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