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463 lines
15 KiB
463 lines
15 KiB
/* |
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* WMA compatible encoder |
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* Copyright (c) 2007 Michael Niedermayer |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "config_components.h" |
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#include "libavutil/attributes.h" |
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#include "libavutil/ffmath.h" |
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#include "avcodec.h" |
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#include "encode.h" |
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#include "internal.h" |
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#include "wma.h" |
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#include "libavutil/avassert.h" |
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static av_cold int encode_init(AVCodecContext *avctx) |
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{ |
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WMACodecContext *s = avctx->priv_data; |
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int i, flags1, flags2, block_align; |
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uint8_t *extradata; |
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int ret; |
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s->avctx = avctx; |
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if (avctx->ch_layout.nb_channels > MAX_CHANNELS) { |
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av_log(avctx, AV_LOG_ERROR, |
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"too many channels: got %i, need %i or fewer\n", |
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avctx->ch_layout.nb_channels, MAX_CHANNELS); |
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return AVERROR(EINVAL); |
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} |
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if (avctx->sample_rate > 48000) { |
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av_log(avctx, AV_LOG_ERROR, "sample rate is too high: %d > 48kHz\n", |
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avctx->sample_rate); |
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return AVERROR(EINVAL); |
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} |
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if (avctx->bit_rate < 24 * 1000) { |
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av_log(avctx, AV_LOG_ERROR, |
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"bitrate too low: got %"PRId64", need 24000 or higher\n", |
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avctx->bit_rate); |
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return AVERROR(EINVAL); |
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} |
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/* extract flag info */ |
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flags1 = 0; |
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flags2 = 1; |
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if (avctx->codec->id == AV_CODEC_ID_WMAV1) { |
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extradata = av_malloc(4); |
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if (!extradata) |
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return AVERROR(ENOMEM); |
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avctx->extradata_size = 4; |
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AV_WL16(extradata, flags1); |
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AV_WL16(extradata + 2, flags2); |
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} else if (avctx->codec->id == AV_CODEC_ID_WMAV2) { |
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extradata = av_mallocz(10); |
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if (!extradata) |
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return AVERROR(ENOMEM); |
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avctx->extradata_size = 10; |
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AV_WL32(extradata, flags1); |
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AV_WL16(extradata + 4, flags2); |
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} else { |
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av_assert0(0); |
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} |
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avctx->extradata = extradata; |
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s->use_exp_vlc = flags2 & 0x0001; |
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s->use_bit_reservoir = flags2 & 0x0002; |
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s->use_variable_block_len = flags2 & 0x0004; |
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if (avctx->ch_layout.nb_channels == 2) |
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s->ms_stereo = 1; |
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if ((ret = ff_wma_init(avctx, flags2)) < 0) |
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return ret; |
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/* init MDCT */ |
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for (i = 0; i < s->nb_block_sizes; i++) { |
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ret = ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 0, 1.0); |
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if (ret < 0) |
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return ret; |
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} |
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block_align = avctx->bit_rate * (int64_t) s->frame_len / |
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(avctx->sample_rate * 8); |
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block_align = FFMIN(block_align, MAX_CODED_SUPERFRAME_SIZE); |
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avctx->block_align = block_align; |
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avctx->frame_size = avctx->initial_padding = s->frame_len; |
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return 0; |
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} |
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static int apply_window_and_mdct(AVCodecContext *avctx, const AVFrame *frame) |
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{ |
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WMACodecContext *s = avctx->priv_data; |
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float **audio = (float **) frame->extended_data; |
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int len = frame->nb_samples; |
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int window_index = s->frame_len_bits - s->block_len_bits; |
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FFTContext *mdct = &s->mdct_ctx[window_index]; |
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int ch; |
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const float *win = s->windows[window_index]; |
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int window_len = 1 << s->block_len_bits; |
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float n = 2.0 * 32768.0 / window_len; |
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for (ch = 0; ch < avctx->ch_layout.nb_channels; ch++) { |
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memcpy(s->output, s->frame_out[ch], window_len * sizeof(*s->output)); |
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s->fdsp->vector_fmul_scalar(s->frame_out[ch], audio[ch], n, len); |
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s->fdsp->vector_fmul_reverse(&s->output[window_len], s->frame_out[ch], |
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win, len); |
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s->fdsp->vector_fmul(s->frame_out[ch], s->frame_out[ch], win, len); |
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mdct->mdct_calc(mdct, s->coefs[ch], s->output); |
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if (!isfinite(s->coefs[ch][0])) { |
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av_log(avctx, AV_LOG_ERROR, "Input contains NaN/+-Inf\n"); |
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return AVERROR(EINVAL); |
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} |
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} |
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return 0; |
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} |
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// FIXME use for decoding too |
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static void init_exp(WMACodecContext *s, int ch, const int *exp_param) |
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{ |
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int n; |
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const uint16_t *ptr; |
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float v, *q, max_scale, *q_end; |
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ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits]; |
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q = s->exponents[ch]; |
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q_end = q + s->block_len; |
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max_scale = 0; |
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while (q < q_end) { |
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/* XXX: use a table */ |
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v = ff_exp10(*exp_param++ *(1.0 / 16.0)); |
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max_scale = FFMAX(max_scale, v); |
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n = *ptr++; |
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do { |
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*q++ = v; |
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} while (--n); |
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} |
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s->max_exponent[ch] = max_scale; |
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} |
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static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param) |
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{ |
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int last_exp; |
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const uint16_t *ptr; |
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float *q, *q_end; |
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ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits]; |
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q = s->exponents[ch]; |
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q_end = q + s->block_len; |
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if (s->version == 1) { |
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last_exp = *exp_param++; |
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av_assert0(last_exp - 10 >= 0 && last_exp - 10 < 32); |
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put_bits(&s->pb, 5, last_exp - 10); |
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q += *ptr++; |
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} else |
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last_exp = 36; |
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while (q < q_end) { |
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int exp = *exp_param++; |
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int code = exp - last_exp + 60; |
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av_assert1(code >= 0 && code < 120); |
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put_bits(&s->pb, ff_aac_scalefactor_bits[code], |
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ff_aac_scalefactor_code[code]); |
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/* XXX: use a table */ |
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q += *ptr++; |
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last_exp = exp; |
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} |
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} |
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static int encode_block(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], |
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int total_gain) |
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{ |
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int channels = s->avctx->ch_layout.nb_channels; |
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int v, bsize, ch, coef_nb_bits, parse_exponents; |
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float mdct_norm; |
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int nb_coefs[MAX_CHANNELS]; |
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static const int fixed_exp[25] = { |
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20, 20, 20, 20, 20, |
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20, 20, 20, 20, 20, |
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20, 20, 20, 20, 20, |
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20, 20, 20, 20, 20, |
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20, 20, 20, 20, 20 |
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}; |
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// FIXME remove duplication relative to decoder |
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if (s->use_variable_block_len) { |
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av_assert0(0); // FIXME not implemented |
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} else { |
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/* fixed block len */ |
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s->next_block_len_bits = s->frame_len_bits; |
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s->prev_block_len_bits = s->frame_len_bits; |
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s->block_len_bits = s->frame_len_bits; |
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} |
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s->block_len = 1 << s->block_len_bits; |
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// av_assert0((s->block_pos + s->block_len) <= s->frame_len); |
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bsize = s->frame_len_bits - s->block_len_bits; |
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// FIXME factor |
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v = s->coefs_end[bsize] - s->coefs_start; |
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for (ch = 0; ch < channels; ch++) |
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nb_coefs[ch] = v; |
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{ |
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int n4 = s->block_len / 2; |
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mdct_norm = 1.0 / (float) n4; |
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if (s->version == 1) |
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mdct_norm *= sqrt(n4); |
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} |
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if (channels == 2) |
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put_bits(&s->pb, 1, !!s->ms_stereo); |
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for (ch = 0; ch < channels; ch++) { |
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// FIXME only set channel_coded when needed, instead of always |
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s->channel_coded[ch] = 1; |
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if (s->channel_coded[ch]) |
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init_exp(s, ch, fixed_exp); |
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} |
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for (ch = 0; ch < channels; ch++) { |
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if (s->channel_coded[ch]) { |
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WMACoef *coefs1; |
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float *coefs, *exponents, mult; |
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int i, n; |
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coefs1 = s->coefs1[ch]; |
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exponents = s->exponents[ch]; |
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mult = ff_exp10(total_gain * 0.05) / s->max_exponent[ch]; |
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mult *= mdct_norm; |
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coefs = src_coefs[ch]; |
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if (s->use_noise_coding && 0) { |
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av_assert0(0); // FIXME not implemented |
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} else { |
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coefs += s->coefs_start; |
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n = nb_coefs[ch]; |
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for (i = 0; i < n; i++) { |
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double t = *coefs++ / (exponents[i] * mult); |
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if (t < -32768 || t > 32767) |
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return -1; |
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coefs1[i] = lrint(t); |
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} |
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} |
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} |
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} |
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v = 0; |
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for (ch = 0; ch < channels; ch++) { |
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int a = s->channel_coded[ch]; |
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put_bits(&s->pb, 1, a); |
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v |= a; |
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} |
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if (!v) |
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return 1; |
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for (v = total_gain - 1; v >= 127; v -= 127) |
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put_bits(&s->pb, 7, 127); |
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put_bits(&s->pb, 7, v); |
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coef_nb_bits = ff_wma_total_gain_to_bits(total_gain); |
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if (s->use_noise_coding) { |
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for (ch = 0; ch < channels; ch++) { |
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if (s->channel_coded[ch]) { |
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int i, n; |
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n = s->exponent_high_sizes[bsize]; |
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for (i = 0; i < n; i++) { |
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put_bits(&s->pb, 1, s->high_band_coded[ch][i] = 0); |
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if (0) |
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nb_coefs[ch] -= s->exponent_high_bands[bsize][i]; |
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} |
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} |
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} |
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} |
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parse_exponents = 1; |
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if (s->block_len_bits != s->frame_len_bits) |
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put_bits(&s->pb, 1, parse_exponents); |
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if (parse_exponents) { |
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for (ch = 0; ch < channels; ch++) { |
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if (s->channel_coded[ch]) { |
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if (s->use_exp_vlc) { |
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encode_exp_vlc(s, ch, fixed_exp); |
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} else { |
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av_assert0(0); // FIXME not implemented |
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// encode_exp_lsp(s, ch); |
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} |
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} |
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} |
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} else |
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av_assert0(0); // FIXME not implemented |
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for (ch = 0; ch < channels; ch++) { |
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if (s->channel_coded[ch]) { |
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int run, tindex; |
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WMACoef *ptr, *eptr; |
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tindex = (ch == 1 && s->ms_stereo); |
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ptr = &s->coefs1[ch][0]; |
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eptr = ptr + nb_coefs[ch]; |
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run = 0; |
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for (; ptr < eptr; ptr++) { |
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if (*ptr) { |
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int level = *ptr; |
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int abs_level = FFABS(level); |
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int code = 0; |
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if (abs_level <= s->coef_vlcs[tindex]->max_level) |
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if (run < s->coef_vlcs[tindex]->levels[abs_level - 1]) |
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code = run + s->int_table[tindex][abs_level - 1]; |
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av_assert2(code < s->coef_vlcs[tindex]->n); |
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put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code], |
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s->coef_vlcs[tindex]->huffcodes[code]); |
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if (code == 0) { |
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if (1 << coef_nb_bits <= abs_level) |
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return -1; |
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put_bits(&s->pb, coef_nb_bits, abs_level); |
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put_bits(&s->pb, s->frame_len_bits, run); |
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} |
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// FIXME the sign is flipped somewhere |
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put_bits(&s->pb, 1, level < 0); |
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run = 0; |
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} else |
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run++; |
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} |
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if (run) |
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put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1], |
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s->coef_vlcs[tindex]->huffcodes[1]); |
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} |
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if (s->version == 1 && channels >= 2) |
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align_put_bits(&s->pb); |
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} |
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return 0; |
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} |
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static int encode_frame(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], |
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uint8_t *buf, int buf_size, int total_gain) |
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{ |
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init_put_bits(&s->pb, buf, buf_size); |
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if (s->use_bit_reservoir) |
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av_assert0(0); // FIXME not implemented |
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else if (encode_block(s, src_coefs, total_gain) < 0) |
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return INT_MAX; |
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align_put_bits(&s->pb); |
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return put_bits_count(&s->pb) / 8 - s->avctx->block_align; |
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} |
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static int encode_superframe(AVCodecContext *avctx, AVPacket *avpkt, |
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const AVFrame *frame, int *got_packet_ptr) |
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{ |
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WMACodecContext *s = avctx->priv_data; |
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int i, total_gain, ret, error; |
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s->block_len_bits = s->frame_len_bits; // required by non variable block len |
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s->block_len = 1 << s->block_len_bits; |
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ret = apply_window_and_mdct(avctx, frame); |
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if (ret < 0) |
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return ret; |
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if (s->ms_stereo) { |
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float a, b; |
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int i; |
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for (i = 0; i < s->block_len; i++) { |
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a = s->coefs[0][i] * 0.5; |
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b = s->coefs[1][i] * 0.5; |
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s->coefs[0][i] = a + b; |
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s->coefs[1][i] = a - b; |
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} |
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} |
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if ((ret = ff_alloc_packet(avctx, avpkt, 2 * MAX_CODED_SUPERFRAME_SIZE)) < 0) |
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return ret; |
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total_gain = 128; |
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for (i = 64; i; i >>= 1) { |
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error = encode_frame(s, s->coefs, avpkt->data, avpkt->size, |
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total_gain - i); |
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if (error <= 0) |
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total_gain -= i; |
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} |
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while(total_gain <= 128 && error > 0) |
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error = encode_frame(s, s->coefs, avpkt->data, avpkt->size, total_gain++); |
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if (error > 0) { |
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av_log(avctx, AV_LOG_ERROR, "Invalid input data or requested bitrate too low, cannot encode\n"); |
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avpkt->size = 0; |
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return AVERROR(EINVAL); |
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} |
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av_assert0((put_bits_count(&s->pb) & 7) == 0); |
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i = avctx->block_align - put_bytes_count(&s->pb, 0); |
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av_assert0(i>=0); |
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while(i--) |
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put_bits(&s->pb, 8, 'N'); |
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flush_put_bits(&s->pb); |
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av_assert0(put_bits_ptr(&s->pb) - s->pb.buf == avctx->block_align); |
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if (frame->pts != AV_NOPTS_VALUE) |
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avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding); |
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avpkt->size = avctx->block_align; |
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*got_packet_ptr = 1; |
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return 0; |
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} |
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#if CONFIG_WMAV1_ENCODER |
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const AVCodec ff_wmav1_encoder = { |
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.name = "wmav1", |
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.long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"), |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = AV_CODEC_ID_WMAV1, |
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.priv_data_size = sizeof(WMACodecContext), |
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.init = encode_init, |
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.encode2 = encode_superframe, |
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.close = ff_wma_end, |
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.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, |
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AV_SAMPLE_FMT_NONE }, |
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, |
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}; |
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#endif |
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#if CONFIG_WMAV2_ENCODER |
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const AVCodec ff_wmav2_encoder = { |
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.name = "wmav2", |
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.long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"), |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = AV_CODEC_ID_WMAV2, |
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.priv_data_size = sizeof(WMACodecContext), |
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.init = encode_init, |
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.encode2 = encode_superframe, |
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.close = ff_wma_end, |
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.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, |
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AV_SAMPLE_FMT_NONE }, |
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, |
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}; |
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#endif
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