diff options
Diffstat (limited to 'ffmpeg1/libavcodec/libvo-amrwbenc.c')
| -rw-r--r-- | ffmpeg1/libavcodec/libvo-amrwbenc.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/ffmpeg1/libavcodec/libvo-amrwbenc.c b/ffmpeg1/libavcodec/libvo-amrwbenc.c new file mode 100644 index 0000000..a068cd0 --- /dev/null +++ b/ffmpeg1/libavcodec/libvo-amrwbenc.c @@ -0,0 +1,152 @@ +/* + * AMR Audio encoder stub + * Copyright (c) 2003 the ffmpeg project + * + * 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 <vo-amrwbenc/enc_if.h> +#include <stdio.h> +#include <stdlib.h> + +#include "libavutil/avstring.h" +#include "libavutil/internal.h" +#include "libavutil/mem.h" +#include "libavutil/opt.h" +#include "avcodec.h" +#include "internal.h" + +#define MAX_PACKET_SIZE (1 + (477 + 7) / 8) + +typedef struct AMRWBContext { + AVClass *av_class; + void *state; + int mode; + int last_bitrate; + int allow_dtx; +} AMRWBContext; + +static const AVOption options[] = { + { "dtx", "Allow DTX (generate comfort noise)", offsetof(AMRWBContext, allow_dtx), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM }, + { NULL } +}; + +static const AVClass class = { + "libvo_amrwbenc", av_default_item_name, options, LIBAVUTIL_VERSION_INT +}; + +static int get_wb_bitrate_mode(int bitrate, void *log_ctx) +{ + /* make the correspondance between bitrate and mode */ + static const int rates[] = { 6600, 8850, 12650, 14250, 15850, 18250, + 19850, 23050, 23850 }; + int i, best = -1, min_diff = 0; + char log_buf[200]; + + for (i = 0; i < 9; i++) { + if (rates[i] == bitrate) + return i; + if (best < 0 || abs(rates[i] - bitrate) < min_diff) { + best = i; + min_diff = abs(rates[i] - bitrate); + } + } + /* no bitrate matching exactly, log a warning */ + snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of "); + for (i = 0; i < 9; i++) + av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i] / 1000.f); + av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best] / 1000.f); + av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf); + + return best; +} + +static av_cold int amr_wb_encode_init(AVCodecContext *avctx) +{ + AMRWBContext *s = avctx->priv_data; + + if (avctx->sample_rate != 16000 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) { + av_log(avctx, AV_LOG_ERROR, "Only 16000Hz sample rate supported\n"); + return AVERROR(ENOSYS); + } + + if (avctx->channels != 1) { + av_log(avctx, AV_LOG_ERROR, "Only mono supported\n"); + return AVERROR(ENOSYS); + } + + s->mode = get_wb_bitrate_mode(avctx->bit_rate, avctx); + s->last_bitrate = avctx->bit_rate; + + avctx->frame_size = 320; + avctx->delay = 80; + + s->state = E_IF_init(); + + return 0; +} + +static int amr_wb_encode_close(AVCodecContext *avctx) +{ + AMRWBContext *s = avctx->priv_data; + + E_IF_exit(s->state); + return 0; +} + +static int amr_wb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, + const AVFrame *frame, int *got_packet_ptr) +{ + AMRWBContext *s = avctx->priv_data; + const int16_t *samples = (const int16_t *)frame->data[0]; + int size, ret; + + if ((ret = ff_alloc_packet2(avctx, avpkt, MAX_PACKET_SIZE)) < 0) + return ret; + + if (s->last_bitrate != avctx->bit_rate) { + s->mode = get_wb_bitrate_mode(avctx->bit_rate, avctx); + s->last_bitrate = avctx->bit_rate; + } + size = E_IF_encode(s->state, s->mode, samples, avpkt->data, s->allow_dtx); + if (size <= 0 || size > MAX_PACKET_SIZE) { + av_log(avctx, AV_LOG_ERROR, "Error encoding frame\n"); + return AVERROR(EINVAL); + } + + if (frame->pts != AV_NOPTS_VALUE) + avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->delay); + + avpkt->size = size; + *got_packet_ptr = 1; + return 0; +} + +AVCodec ff_libvo_amrwbenc_encoder = { + .name = "libvo_amrwbenc", + .type = AVMEDIA_TYPE_AUDIO, + .id = AV_CODEC_ID_AMR_WB, + .priv_data_size = sizeof(AMRWBContext), + .init = amr_wb_encode_init, + .encode2 = amr_wb_encode_frame, + .close = amr_wb_encode_close, + .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, + AV_SAMPLE_FMT_NONE }, + .long_name = NULL_IF_CONFIG_SMALL("Android VisualOn AMR-WB " + "(Adaptive Multi-Rate Wide-Band)"), + .priv_class = &class, +}; |