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2df0c32ea1
Currently, the amount of padding inserted at the beginning by some audio encoders, is exported through AVCodecContext.delay. However - the term 'delay' is heavily overloaded and can have multiple different meanings even in the case of audio encoding. - this field has entirely different meanings, depending on whether the codec context is used for encoding or decoding (and has yet another different meaning for video), preventing generic handling of the codec context. Therefore, add a new field -- AVCodecContext.initial_padding. It could conceivably be used for decoding as well at a later point.
226 lines
8.2 KiB
C
226 lines
8.2 KiB
C
/*
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* Interface to libtwolame for mp2 encoding
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* Copyright (c) 2012 Paul B Mahol
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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/**
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* @file
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* Interface to libtwolame for mp2 encoding.
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*/
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#include <twolame.h>
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#include "libavutil/common.h"
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#include "libavutil/opt.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "mpegaudio.h"
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typedef struct TWOLAMEContext {
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AVClass *class;
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int mode;
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int psymodel;
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int energy;
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int error_protection;
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int copyright;
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int original;
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int verbosity;
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twolame_options *glopts;
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int64_t next_pts;
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} TWOLAMEContext;
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static av_cold int twolame_encode_close(AVCodecContext *avctx)
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{
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TWOLAMEContext *s = avctx->priv_data;
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twolame_close(&s->glopts);
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return 0;
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}
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static av_cold int twolame_encode_init(AVCodecContext *avctx)
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{
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TWOLAMEContext *s = avctx->priv_data;
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int ret;
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avctx->frame_size = TWOLAME_SAMPLES_PER_FRAME;
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avctx->initial_padding = 512 - 32 + 1;
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s->glopts = twolame_init();
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if (!s->glopts)
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return AVERROR(ENOMEM);
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twolame_set_verbosity(s->glopts, s->verbosity);
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twolame_set_mode(s->glopts, s->mode);
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twolame_set_psymodel(s->glopts, s->psymodel);
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twolame_set_energy_levels(s->glopts, s->energy);
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twolame_set_error_protection(s->glopts, s->error_protection);
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twolame_set_copyright(s->glopts, s->copyright);
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twolame_set_original(s->glopts, s->original);
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twolame_set_num_channels(s->glopts, avctx->channels);
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twolame_set_in_samplerate(s->glopts, avctx->sample_rate);
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twolame_set_out_samplerate(s->glopts, avctx->sample_rate);
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if (avctx->flags & CODEC_FLAG_QSCALE || !avctx->bit_rate) {
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twolame_set_VBR(s->glopts, TRUE);
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twolame_set_VBR_level(s->glopts,
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avctx->global_quality / (float) FF_QP2LAMBDA);
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av_log(avctx, AV_LOG_WARNING,
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"VBR in MP2 is a hack, use another codec that supports it.\n");
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} else {
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twolame_set_bitrate(s->glopts, avctx->bit_rate / 1000);
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}
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ret = twolame_init_params(s->glopts);
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if (ret) {
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twolame_encode_close(avctx);
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return AVERROR_UNKNOWN;
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}
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return 0;
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}
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static int twolame_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
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const AVFrame *frame, int *got_packet_ptr)
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{
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TWOLAMEContext *s = avctx->priv_data;
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int ret;
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if ((ret = ff_alloc_packet(avpkt, MPA_MAX_CODED_FRAME_SIZE)) < 0)
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return ret;
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if (frame) {
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switch (avctx->sample_fmt) {
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case AV_SAMPLE_FMT_FLT:
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ret = twolame_encode_buffer_float32_interleaved(s->glopts,
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(const float *)frame->data[0],
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frame->nb_samples,
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avpkt->data,
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avpkt->size);
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break;
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case AV_SAMPLE_FMT_FLTP:
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ret = twolame_encode_buffer_float32(s->glopts,
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(const float *)frame->data[0],
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(const float *)frame->data[1],
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frame->nb_samples,
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avpkt->data, avpkt->size);
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break;
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case AV_SAMPLE_FMT_S16:
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ret = twolame_encode_buffer_interleaved(s->glopts,
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(const short int *)frame->data[0],
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frame->nb_samples,
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avpkt->data, avpkt->size);
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break;
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case AV_SAMPLE_FMT_S16P:
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ret = twolame_encode_buffer(s->glopts,
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(const short int *)frame->data[0],
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(const short int *)frame->data[1],
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frame->nb_samples,
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avpkt->data, avpkt->size);
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break;
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default:
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av_log(avctx, AV_LOG_ERROR,
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"Unsupported sample format %d.\n", avctx->sample_fmt);
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return AVERROR_BUG;
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}
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} else {
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ret = twolame_encode_flush(s->glopts, avpkt->data, avpkt->size);
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}
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if (!ret) // no bytes written
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return 0;
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if (ret < 0) // twolame error
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return AVERROR_UNKNOWN;
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avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples);
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if (frame) {
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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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} else {
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avpkt->pts = s->next_pts;
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}
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// this is for setting pts for flushed packet(s).
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if (avpkt->pts != AV_NOPTS_VALUE)
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s->next_pts = avpkt->pts + avpkt->duration;
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av_shrink_packet(avpkt, ret);
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*got_packet_ptr = 1;
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return 0;
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}
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#define OFFSET(x) offsetof(TWOLAMEContext, x)
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#define AE AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{ "mode", "Mpeg Mode", OFFSET(mode), AV_OPT_TYPE_INT, { .i64 = TWOLAME_AUTO_MODE }, TWOLAME_AUTO_MODE, TWOLAME_MONO, AE, "mode"},
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{ "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_AUTO_MODE }, 0, 0, AE, "mode" },
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{ "stereo", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_STEREO }, 0, 0, AE, "mode" },
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{ "joint_stereo", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_JOINT_STEREO }, 0, 0, AE, "mode" },
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{ "dual_channel", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_DUAL_CHANNEL }, 0, 0, AE, "mode" },
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{ "mono", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_MONO }, 0, 0, AE, "mode" },
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{ "psymodel", "Psychoacoustic Model", OFFSET(psymodel), AV_OPT_TYPE_INT, { .i64 = 3 }, -1, 4, AE},
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{ "energy_levels","enable energy levels", OFFSET(energy), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
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{ "error_protection","enable CRC error protection", OFFSET(error_protection), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
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{ "copyright", "set MPEG Audio Copyright flag", OFFSET(copyright), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
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{ "original", "set MPEG Audio Original flag", OFFSET(original), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
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{ "verbosity", "set library optput level (0-10)", OFFSET(verbosity), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 10, AE},
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{ NULL },
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};
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static const AVClass twolame_class = {
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.class_name = "libtwolame encoder",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static const AVCodecDefault twolame_defaults[] = {
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{ "b", "384000" },
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{ NULL },
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};
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static const int twolame_samplerates[] = {
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16000, 22050, 24000, 32000, 44100, 48000, 0
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};
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AVCodec ff_libtwolame_encoder = {
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.name = "libtwolame",
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.long_name = NULL_IF_CONFIG_SMALL("libtwolame MP2 (MPEG audio layer 2)"),
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.type = AVMEDIA_TYPE_AUDIO,
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.id = AV_CODEC_ID_MP2,
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.priv_data_size = sizeof(TWOLAMEContext),
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.init = twolame_encode_init,
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.encode2 = twolame_encode_frame,
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.close = twolame_encode_close,
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.capabilities = CODEC_CAP_DELAY,
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.defaults = twolame_defaults,
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.priv_class = &twolame_class,
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.sample_fmts = (const enum AVSampleFormat[]) {
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AV_SAMPLE_FMT_FLT,
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AV_SAMPLE_FMT_FLTP,
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AV_SAMPLE_FMT_S16,
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AV_SAMPLE_FMT_S16P,
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AV_SAMPLE_FMT_NONE
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},
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.channel_layouts = (const uint64_t[]) {
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AV_CH_LAYOUT_MONO,
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AV_CH_LAYOUT_STEREO,
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0 },
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.supported_samplerates = twolame_samplerates,
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};
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