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Diffstat (limited to 'ffmpeg/libavcodec/wmaenc.c')
-rw-r--r--ffmpeg/libavcodec/wmaenc.c421
1 files changed, 421 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/wmaenc.c b/ffmpeg/libavcodec/wmaenc.c
new file mode 100644
index 0000000..799535e
--- /dev/null
+++ b/ffmpeg/libavcodec/wmaenc.c
@@ -0,0 +1,421 @@
+/*
+ * WMA compatible encoder
+ * Copyright (c) 2007 Michael Niedermayer
+ *
+ * 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 "avcodec.h"
+#include "internal.h"
+#include "wma.h"
+#include "libavutil/avassert.h"
+
+
+static int encode_init(AVCodecContext * avctx){
+ WMACodecContext *s = avctx->priv_data;
+ int i, flags1, flags2, block_align;
+ uint8_t *extradata;
+
+ s->avctx = avctx;
+
+ if(avctx->channels > MAX_CHANNELS) {
+ av_log(avctx, AV_LOG_ERROR, "too many channels: got %i, need %i or fewer\n",
+ avctx->channels, MAX_CHANNELS);
+ return AVERROR(EINVAL);
+ }
+
+ if (avctx->sample_rate > 48000) {
+ av_log(avctx, AV_LOG_ERROR, "sample rate is too high: %d > 48kHz\n",
+ avctx->sample_rate);
+ return AVERROR(EINVAL);
+ }
+
+ if(avctx->bit_rate < 24*1000) {
+ av_log(avctx, AV_LOG_ERROR, "bitrate too low: got %i, need 24000 or higher\n",
+ avctx->bit_rate);
+ return AVERROR(EINVAL);
+ }
+
+ /* extract flag infos */
+ flags1 = 0;
+ flags2 = 1;
+ if (avctx->codec->id == AV_CODEC_ID_WMAV1) {
+ extradata= av_malloc(4);
+ avctx->extradata_size= 4;
+ AV_WL16(extradata, flags1);
+ AV_WL16(extradata+2, flags2);
+ } else if (avctx->codec->id == AV_CODEC_ID_WMAV2) {
+ extradata= av_mallocz(10);
+ avctx->extradata_size= 10;
+ AV_WL32(extradata, flags1);
+ AV_WL16(extradata+4, flags2);
+ }else
+ av_assert0(0);
+ avctx->extradata= extradata;
+ s->use_exp_vlc = flags2 & 0x0001;
+ s->use_bit_reservoir = flags2 & 0x0002;
+ s->use_variable_block_len = flags2 & 0x0004;
+ if (avctx->channels == 2)
+ s->ms_stereo = 1;
+
+ ff_wma_init(avctx, flags2);
+
+ /* init MDCT */
+ for(i = 0; i < s->nb_block_sizes; i++)
+ ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 0, 1.0);
+
+ block_align = avctx->bit_rate * (int64_t)s->frame_len /
+ (avctx->sample_rate * 8);
+ block_align = FFMIN(block_align, MAX_CODED_SUPERFRAME_SIZE);
+ avctx->block_align = block_align;
+
+ avctx->frame_size = avctx->delay = s->frame_len;
+
+ return 0;
+}
+
+
+static void apply_window_and_mdct(AVCodecContext * avctx, const AVFrame *frame)
+{
+ WMACodecContext *s = avctx->priv_data;
+ float **audio = (float **)frame->extended_data;
+ int len = frame->nb_samples;
+ int window_index= s->frame_len_bits - s->block_len_bits;
+ FFTContext *mdct = &s->mdct_ctx[window_index];
+ int ch;
+ const float * win = s->windows[window_index];
+ int window_len = 1 << s->block_len_bits;
+ float n = 2.0 * 32768.0 / window_len;
+
+ for (ch = 0; ch < avctx->channels; ch++) {
+ memcpy(s->output, s->frame_out[ch], window_len * sizeof(*s->output));
+ s->fdsp.vector_fmul_scalar(s->frame_out[ch], audio[ch], n, len);
+ s->fdsp.vector_fmul_reverse(&s->output[window_len], s->frame_out[ch], win, len);
+ s->fdsp.vector_fmul(s->frame_out[ch], s->frame_out[ch], win, len);
+ mdct->mdct_calc(mdct, s->coefs[ch], s->output);
+ }
+}
+
+//FIXME use for decoding too
+static void init_exp(WMACodecContext *s, int ch, const int *exp_param){
+ int n;
+ const uint16_t *ptr;
+ float v, *q, max_scale, *q_end;
+
+ ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
+ q = s->exponents[ch];
+ q_end = q + s->block_len;
+ max_scale = 0;
+ while (q < q_end) {
+ /* XXX: use a table */
+ v = pow(10, *exp_param++ * (1.0 / 16.0));
+ max_scale= FFMAX(max_scale, v);
+ n = *ptr++;
+ do {
+ *q++ = v;
+ } while (--n);
+ }
+ s->max_exponent[ch] = max_scale;
+}
+
+static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param){
+ int last_exp;
+ const uint16_t *ptr;
+ float *q, *q_end;
+
+ ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
+ q = s->exponents[ch];
+ q_end = q + s->block_len;
+ if (s->version == 1) {
+ last_exp= *exp_param++;
+ av_assert0(last_exp-10 >= 0 && last_exp-10 < 32);
+ put_bits(&s->pb, 5, last_exp - 10);
+ q+= *ptr++;
+ }else
+ last_exp = 36;
+ while (q < q_end) {
+ int exp = *exp_param++;
+ int code = exp - last_exp + 60;
+ av_assert1(code >= 0 && code < 120);
+ put_bits(&s->pb, ff_aac_scalefactor_bits[code], ff_aac_scalefactor_code[code]);
+ /* XXX: use a table */
+ q+= *ptr++;
+ last_exp= exp;
+ }
+}
+
+static int encode_block(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], int total_gain){
+ int v, bsize, ch, coef_nb_bits, parse_exponents;
+ float mdct_norm;
+ int nb_coefs[MAX_CHANNELS];
+ static const int fixed_exp[25]={20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20};
+
+ //FIXME remove duplication relative to decoder
+ if (s->use_variable_block_len) {
+ av_assert0(0); //FIXME not implemented
+ }else{
+ /* fixed block len */
+ s->next_block_len_bits = s->frame_len_bits;
+ s->prev_block_len_bits = s->frame_len_bits;
+ s->block_len_bits = s->frame_len_bits;
+ }
+
+ s->block_len = 1 << s->block_len_bits;
+// assert((s->block_pos + s->block_len) <= s->frame_len);
+ bsize = s->frame_len_bits - s->block_len_bits;
+
+ //FIXME factor
+ v = s->coefs_end[bsize] - s->coefs_start;
+ for (ch = 0; ch < s->avctx->channels; ch++)
+ nb_coefs[ch] = v;
+ {
+ int n4 = s->block_len / 2;
+ mdct_norm = 1.0 / (float)n4;
+ if (s->version == 1) {
+ mdct_norm *= sqrt(n4);
+ }
+ }
+
+ if (s->avctx->channels == 2) {
+ put_bits(&s->pb, 1, !!s->ms_stereo);
+ }
+
+ for (ch = 0; ch < s->avctx->channels; ch++) {
+ s->channel_coded[ch] = 1; //FIXME only set channel_coded when needed, instead of always
+ if (s->channel_coded[ch]) {
+ init_exp(s, ch, fixed_exp);
+ }
+ }
+
+ for (ch = 0; ch < s->avctx->channels; ch++) {
+ if (s->channel_coded[ch]) {
+ WMACoef *coefs1;
+ float *coefs, *exponents, mult;
+ int i, n;
+
+ coefs1 = s->coefs1[ch];
+ exponents = s->exponents[ch];
+ mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
+ mult *= mdct_norm;
+ coefs = src_coefs[ch];
+ if (s->use_noise_coding && 0) {
+ av_assert0(0); //FIXME not implemented
+ } else {
+ coefs += s->coefs_start;
+ n = nb_coefs[ch];
+ for(i = 0;i < n; i++){
+ double t= *coefs++ / (exponents[i] * mult);
+ if(t<-32768 || t>32767)
+ return -1;
+
+ coefs1[i] = lrint(t);
+ }
+ }
+ }
+ }
+
+ v = 0;
+ for (ch = 0; ch < s->avctx->channels; ch++) {
+ int a = s->channel_coded[ch];
+ put_bits(&s->pb, 1, a);
+ v |= a;
+ }
+
+ if (!v)
+ return 1;
+
+ for(v= total_gain-1; v>=127; v-= 127)
+ put_bits(&s->pb, 7, 127);
+ put_bits(&s->pb, 7, v);
+
+ coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);
+
+ if (s->use_noise_coding) {
+ for (ch = 0; ch < s->avctx->channels; ch++) {
+ if (s->channel_coded[ch]) {
+ int i, n;
+ n = s->exponent_high_sizes[bsize];
+ for(i=0;i<n;i++) {
+ put_bits(&s->pb, 1, s->high_band_coded[ch][i]= 0);
+ if (0)
+ nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
+ }
+ }
+ }
+ }
+
+ parse_exponents = 1;
+ if (s->block_len_bits != s->frame_len_bits) {
+ put_bits(&s->pb, 1, parse_exponents);
+ }
+
+ if (parse_exponents) {
+ for (ch = 0; ch < s->avctx->channels; ch++) {
+ if (s->channel_coded[ch]) {
+ if (s->use_exp_vlc) {
+ encode_exp_vlc(s, ch, fixed_exp);
+ } else {
+ av_assert0(0); //FIXME not implemented
+// encode_exp_lsp(s, ch);
+ }
+ }
+ }
+ } else {
+ av_assert0(0); //FIXME not implemented
+ }
+
+ for (ch = 0; ch < s->avctx->channels; ch++) {
+ if (s->channel_coded[ch]) {
+ int run, tindex;
+ WMACoef *ptr, *eptr;
+ tindex = (ch == 1 && s->ms_stereo);
+ ptr = &s->coefs1[ch][0];
+ eptr = ptr + nb_coefs[ch];
+
+ run=0;
+ for(;ptr < eptr; ptr++){
+ if(*ptr){
+ int level= *ptr;
+ int abs_level= FFABS(level);
+ int code= 0;
+ if(abs_level <= s->coef_vlcs[tindex]->max_level){
+ if(run < s->coef_vlcs[tindex]->levels[abs_level-1])
+ code= run + s->int_table[tindex][abs_level-1];
+ }
+
+ av_assert2(code < s->coef_vlcs[tindex]->n);
+ put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code], s->coef_vlcs[tindex]->huffcodes[code]);
+
+ if(code == 0){
+ if(1<<coef_nb_bits <= abs_level)
+ return -1;
+
+ put_bits(&s->pb, coef_nb_bits, abs_level);
+ put_bits(&s->pb, s->frame_len_bits, run);
+ }
+ put_bits(&s->pb, 1, level < 0); //FIXME the sign is fliped somewhere
+ run=0;
+ }else{
+ run++;
+ }
+ }
+ if(run)
+ put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1], s->coef_vlcs[tindex]->huffcodes[1]);
+ }
+ if (s->version == 1 && s->avctx->channels >= 2) {
+ avpriv_align_put_bits(&s->pb);
+ }
+ }
+ return 0;
+}
+
+static int encode_frame(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], uint8_t *buf, int buf_size, int total_gain){
+ init_put_bits(&s->pb, buf, buf_size);
+
+ if (s->use_bit_reservoir) {
+ av_assert0(0);//FIXME not implemented
+ }else{
+ if(encode_block(s, src_coefs, total_gain) < 0)
+ return INT_MAX;
+ }
+
+ avpriv_align_put_bits(&s->pb);
+
+ return put_bits_count(&s->pb) / 8 - s->avctx->block_align;
+}
+
+static int encode_superframe(AVCodecContext *avctx, AVPacket *avpkt,
+ const AVFrame *frame, int *got_packet_ptr)
+{
+ WMACodecContext *s = avctx->priv_data;
+ int i, total_gain, ret, error;
+
+ s->block_len_bits= s->frame_len_bits; //required by non variable block len
+ s->block_len = 1 << s->block_len_bits;
+
+ apply_window_and_mdct(avctx, frame);
+
+ if (s->ms_stereo) {
+ float a, b;
+ int i;
+
+ for(i = 0; i < s->block_len; i++) {
+ a = s->coefs[0][i]*0.5;
+ b = s->coefs[1][i]*0.5;
+ s->coefs[0][i] = a + b;
+ s->coefs[1][i] = a - b;
+ }
+ }
+
+ if ((ret = ff_alloc_packet2(avctx, avpkt, 2 * MAX_CODED_SUPERFRAME_SIZE)) < 0)
+ return ret;
+
+ total_gain= 128;
+ for(i=64; i; i>>=1){
+ error = encode_frame(s, s->coefs, avpkt->data, avpkt->size,
+ total_gain - i);
+ if(error<=0)
+ total_gain-= i;
+ }
+
+ while(total_gain <= 128 && error > 0)
+ error = encode_frame(s, s->coefs, avpkt->data, avpkt->size, total_gain++);
+ av_assert0((put_bits_count(&s->pb) & 7) == 0);
+ i= avctx->block_align - (put_bits_count(&s->pb)+7)/8;
+ av_assert0(i>=0);
+ while(i--)
+ put_bits(&s->pb, 8, 'N');
+
+ flush_put_bits(&s->pb);
+ av_assert0(put_bits_ptr(&s->pb) - s->pb.buf == avctx->block_align);
+
+ if (frame->pts != AV_NOPTS_VALUE)
+ avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->delay);
+
+ avpkt->size = avctx->block_align;
+ *got_packet_ptr = 1;
+ return 0;
+}
+
+#if CONFIG_WMAV1_ENCODER
+AVCodec ff_wmav1_encoder = {
+ .name = "wmav1",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_WMAV1,
+ .priv_data_size = sizeof(WMACodecContext),
+ .init = encode_init,
+ .encode2 = encode_superframe,
+ .close = ff_wma_end,
+ .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
+ AV_SAMPLE_FMT_NONE },
+ .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
+};
+#endif
+#if CONFIG_WMAV2_ENCODER
+AVCodec ff_wmav2_encoder = {
+ .name = "wmav2",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_WMAV2,
+ .priv_data_size = sizeof(WMACodecContext),
+ .init = encode_init,
+ .encode2 = encode_superframe,
+ .close = ff_wma_end,
+ .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
+ AV_SAMPLE_FMT_NONE },
+ .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
+};
+#endif
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