mirror of https://github.com/FFmpeg/FFmpeg.git
Justin Ruggles
13 years ago
parent
52375ba567
commit
b606a01759
7 changed files with 331 additions and 4 deletions
@ -0,0 +1,324 @@ |
|||||||
|
/*
|
||||||
|
* Copyright (C) 2009 Justin Ruggles |
||||||
|
* Copyright (c) 2009 Xuggle Incorporated |
||||||
|
* |
||||||
|
* This file is part of Libav. |
||||||
|
* |
||||||
|
* Libav 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. |
||||||
|
* |
||||||
|
* Libav 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 Libav; if not, write to the Free Software |
||||||
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
||||||
|
*/ |
||||||
|
|
||||||
|
/**
|
||||||
|
* @file |
||||||
|
* libspeex Speex audio encoder |
||||||
|
* |
||||||
|
* Usage Guide |
||||||
|
* This explains the values that need to be set prior to initialization in |
||||||
|
* order to control various encoding parameters. |
||||||
|
* |
||||||
|
* Channels |
||||||
|
* Speex only supports mono or stereo, so avctx->channels must be set to |
||||||
|
* 1 or 2. |
||||||
|
* |
||||||
|
* Sample Rate / Encoding Mode |
||||||
|
* Speex has 3 modes, each of which uses a specific sample rate. |
||||||
|
* narrowband : 8 kHz |
||||||
|
* wideband : 16 kHz |
||||||
|
* ultra-wideband : 32 kHz |
||||||
|
* avctx->sample_rate must be set to one of these 3 values. This will be |
||||||
|
* used to set the encoding mode. |
||||||
|
* |
||||||
|
* Rate Control |
||||||
|
* VBR mode is turned on by setting CODEC_FLAG_QSCALE in avctx->flags. |
||||||
|
* avctx->global_quality is used to set the encoding quality. |
||||||
|
* For CBR mode, avctx->bit_rate can be used to set the constant bitrate. |
||||||
|
* Alternatively, the 'cbr_quality' option can be set from 0 to 10 to set |
||||||
|
* a constant bitrate based on quality. |
||||||
|
* For ABR mode, set avctx->bit_rate and set the 'abr' option to 1. |
||||||
|
* Approx. Bitrate Range: |
||||||
|
* narrowband : 2400 - 25600 bps |
||||||
|
* wideband : 4000 - 43200 bps |
||||||
|
* ultra-wideband : 4400 - 45200 bps |
||||||
|
* |
||||||
|
* Complexity |
||||||
|
* Encoding complexity is controlled by setting avctx->compression_level. |
||||||
|
* The valid range is 0 to 10. A higher setting gives generally better |
||||||
|
* quality at the expense of encoding speed. This does not affect the |
||||||
|
* bit rate. |
||||||
|
* |
||||||
|
* Frames-per-Packet |
||||||
|
* The encoder defaults to using 1 frame-per-packet. However, it is |
||||||
|
* sometimes desirable to use multiple frames-per-packet to reduce the |
||||||
|
* amount of container overhead. This can be done by setting the |
||||||
|
* 'frames_per_packet' option to a value 1 to 8. |
||||||
|
*/ |
||||||
|
|
||||||
|
#include <speex/speex.h> |
||||||
|
#include <speex/speex_header.h> |
||||||
|
#include <speex/speex_stereo.h> |
||||||
|
#include "libavutil/mathematics.h" |
||||||
|
#include "libavutil/opt.h" |
||||||
|
#include "avcodec.h" |
||||||
|
#include "internal.h" |
||||||
|
|
||||||
|
typedef struct { |
||||||
|
AVClass *class; ///< AVClass for private options
|
||||||
|
SpeexBits bits; ///< libspeex bitwriter context
|
||||||
|
SpeexHeader header; ///< libspeex header struct
|
||||||
|
void *enc_state; ///< libspeex encoder state
|
||||||
|
int frames_per_packet; ///< number of frames to encode in each packet
|
||||||
|
float vbr_quality; ///< VBR quality 0.0 to 10.0
|
||||||
|
int cbr_quality; ///< CBR quality 0 to 10
|
||||||
|
int abr; ///< flag to enable ABR
|
||||||
|
int pkt_frame_count; ///< frame count for the current packet
|
||||||
|
int lookahead; ///< encoder delay
|
||||||
|
int sample_count; ///< total sample count (used for pts)
|
||||||
|
} LibSpeexEncContext; |
||||||
|
|
||||||
|
static av_cold void print_enc_params(AVCodecContext *avctx, |
||||||
|
LibSpeexEncContext *s) |
||||||
|
{ |
||||||
|
const char *mode_str = "unknown"; |
||||||
|
|
||||||
|
av_log(avctx, AV_LOG_DEBUG, "channels: %d\n", avctx->channels); |
||||||
|
switch (s->header.mode) { |
||||||
|
case SPEEX_MODEID_NB: mode_str = "narrowband"; break; |
||||||
|
case SPEEX_MODEID_WB: mode_str = "wideband"; break; |
||||||
|
case SPEEX_MODEID_UWB: mode_str = "ultra-wideband"; break; |
||||||
|
} |
||||||
|
av_log(avctx, AV_LOG_DEBUG, "mode: %s\n", mode_str); |
||||||
|
if (s->header.vbr) { |
||||||
|
av_log(avctx, AV_LOG_DEBUG, "rate control: VBR\n"); |
||||||
|
av_log(avctx, AV_LOG_DEBUG, " quality: %f\n", s->vbr_quality); |
||||||
|
} else if (s->abr) { |
||||||
|
av_log(avctx, AV_LOG_DEBUG, "rate control: ABR\n"); |
||||||
|
av_log(avctx, AV_LOG_DEBUG, " bitrate: %d bps\n", avctx->bit_rate); |
||||||
|
} else { |
||||||
|
av_log(avctx, AV_LOG_DEBUG, "rate control: CBR\n"); |
||||||
|
av_log(avctx, AV_LOG_DEBUG, " bitrate: %d bps\n", avctx->bit_rate); |
||||||
|
} |
||||||
|
av_log(avctx, AV_LOG_DEBUG, "complexity: %d\n", |
||||||
|
avctx->compression_level); |
||||||
|
av_log(avctx, AV_LOG_DEBUG, "frame size: %d samples\n", |
||||||
|
avctx->frame_size); |
||||||
|
av_log(avctx, AV_LOG_DEBUG, "frames per packet: %d\n", |
||||||
|
s->frames_per_packet); |
||||||
|
av_log(avctx, AV_LOG_DEBUG, "packet size: %d\n", |
||||||
|
avctx->frame_size * s->frames_per_packet); |
||||||
|
} |
||||||
|
|
||||||
|
static av_cold int encode_init(AVCodecContext *avctx) |
||||||
|
{ |
||||||
|
LibSpeexEncContext *s = avctx->priv_data; |
||||||
|
const SpeexMode *mode; |
||||||
|
uint8_t *header_data; |
||||||
|
int header_size; |
||||||
|
int32_t complexity; |
||||||
|
|
||||||
|
/* channels */ |
||||||
|
if (avctx->channels < 1 || avctx->channels > 2) { |
||||||
|
av_log(avctx, AV_LOG_ERROR, "Invalid channels (%d). Only stereo and " |
||||||
|
"mono are supported\n", avctx->channels); |
||||||
|
return AVERROR(EINVAL); |
||||||
|
} |
||||||
|
|
||||||
|
/* sample rate and encoding mode */ |
||||||
|
switch (avctx->sample_rate) { |
||||||
|
case 8000: mode = &speex_nb_mode; break; |
||||||
|
case 16000: mode = &speex_wb_mode; break; |
||||||
|
case 32000: mode = &speex_uwb_mode; break; |
||||||
|
default: |
||||||
|
av_log(avctx, AV_LOG_ERROR, "Sample rate of %d Hz is not supported. " |
||||||
|
"Resample to 8, 16, or 32 kHz.\n", avctx->sample_rate); |
||||||
|
return AVERROR(EINVAL); |
||||||
|
} |
||||||
|
|
||||||
|
/* initialize libspeex */ |
||||||
|
s->enc_state = speex_encoder_init(mode); |
||||||
|
if (!s->enc_state) { |
||||||
|
av_log(avctx, AV_LOG_ERROR, "Error initializing libspeex\n"); |
||||||
|
return -1; |
||||||
|
} |
||||||
|
speex_init_header(&s->header, avctx->sample_rate, avctx->channels, mode); |
||||||
|
|
||||||
|
/* rate control method and parameters */ |
||||||
|
if (avctx->flags & CODEC_FLAG_QSCALE) { |
||||||
|
/* VBR */ |
||||||
|
s->header.vbr = 1; |
||||||
|
speex_encoder_ctl(s->enc_state, SPEEX_SET_VBR, &s->header.vbr); |
||||||
|
s->vbr_quality = av_clipf(avctx->global_quality / (float)FF_QP2LAMBDA, |
||||||
|
0.0f, 10.0f); |
||||||
|
speex_encoder_ctl(s->enc_state, SPEEX_SET_VBR_QUALITY, &s->vbr_quality); |
||||||
|
} else { |
||||||
|
s->header.bitrate = avctx->bit_rate; |
||||||
|
if (avctx->bit_rate > 0) { |
||||||
|
/* CBR or ABR by bitrate */ |
||||||
|
if (s->abr) { |
||||||
|
speex_encoder_ctl(s->enc_state, SPEEX_SET_ABR, |
||||||
|
&s->header.bitrate); |
||||||
|
speex_encoder_ctl(s->enc_state, SPEEX_GET_ABR, |
||||||
|
&s->header.bitrate); |
||||||
|
} else { |
||||||
|
speex_encoder_ctl(s->enc_state, SPEEX_SET_BITRATE, |
||||||
|
&s->header.bitrate); |
||||||
|
speex_encoder_ctl(s->enc_state, SPEEX_GET_BITRATE, |
||||||
|
&s->header.bitrate); |
||||||
|
} |
||||||
|
} else { |
||||||
|
/* CBR by quality */ |
||||||
|
speex_encoder_ctl(s->enc_state, SPEEX_SET_QUALITY, |
||||||
|
&s->cbr_quality); |
||||||
|
speex_encoder_ctl(s->enc_state, SPEEX_GET_BITRATE, |
||||||
|
&s->header.bitrate); |
||||||
|
} |
||||||
|
/* stereo side information adds about 800 bps to the base bitrate */ |
||||||
|
/* TODO: this should be calculated exactly */ |
||||||
|
avctx->bit_rate = s->header.bitrate + (avctx->channels == 2 ? 800 : 0); |
||||||
|
} |
||||||
|
|
||||||
|
/* set encoding complexity */ |
||||||
|
if (avctx->compression_level > FF_COMPRESSION_DEFAULT) { |
||||||
|
complexity = av_clip(avctx->compression_level, 0, 10); |
||||||
|
speex_encoder_ctl(s->enc_state, SPEEX_SET_COMPLEXITY, &complexity); |
||||||
|
} |
||||||
|
speex_encoder_ctl(s->enc_state, SPEEX_GET_COMPLEXITY, &complexity); |
||||||
|
avctx->compression_level = complexity; |
||||||
|
|
||||||
|
/* set packet size */ |
||||||
|
avctx->frame_size = s->header.frame_size; |
||||||
|
s->header.frames_per_packet = s->frames_per_packet; |
||||||
|
|
||||||
|
/* set encoding delay */ |
||||||
|
speex_encoder_ctl(s->enc_state, SPEEX_GET_LOOKAHEAD, &s->lookahead); |
||||||
|
s->sample_count = -s->lookahead; |
||||||
|
|
||||||
|
/* create header packet bytes from header struct */ |
||||||
|
/* note: libspeex allocates the memory for header_data, which is freed
|
||||||
|
below with speex_header_free() */ |
||||||
|
header_data = speex_header_to_packet(&s->header, &header_size); |
||||||
|
|
||||||
|
/* allocate extradata and coded_frame */ |
||||||
|
avctx->extradata = av_malloc(header_size + FF_INPUT_BUFFER_PADDING_SIZE); |
||||||
|
avctx->coded_frame = avcodec_alloc_frame(); |
||||||
|
if (!avctx->extradata || !avctx->coded_frame) { |
||||||
|
speex_header_free(header_data); |
||||||
|
speex_encoder_destroy(s->enc_state); |
||||||
|
av_log(avctx, AV_LOG_ERROR, "memory allocation error\n"); |
||||||
|
return AVERROR(ENOMEM); |
||||||
|
} |
||||||
|
|
||||||
|
/* copy header packet to extradata */ |
||||||
|
memcpy(avctx->extradata, header_data, header_size); |
||||||
|
avctx->extradata_size = header_size; |
||||||
|
speex_header_free(header_data); |
||||||
|
|
||||||
|
/* init libspeex bitwriter */ |
||||||
|
speex_bits_init(&s->bits); |
||||||
|
|
||||||
|
print_enc_params(avctx, s); |
||||||
|
return 0; |
||||||
|
} |
||||||
|
|
||||||
|
static int encode_frame(AVCodecContext *avctx, uint8_t *frame, int buf_size, |
||||||
|
void *data) |
||||||
|
{ |
||||||
|
LibSpeexEncContext *s = avctx->priv_data; |
||||||
|
int16_t *samples = data; |
||||||
|
int sample_count = s->sample_count; |
||||||
|
|
||||||
|
if (data) { |
||||||
|
/* encode Speex frame */ |
||||||
|
if (avctx->channels == 2) |
||||||
|
speex_encode_stereo_int(samples, s->header.frame_size, &s->bits); |
||||||
|
speex_encode_int(s->enc_state, samples, &s->bits); |
||||||
|
s->pkt_frame_count++; |
||||||
|
s->sample_count += avctx->frame_size; |
||||||
|
} else { |
||||||
|
/* handle end-of-stream */ |
||||||
|
if (!s->pkt_frame_count) |
||||||
|
return 0; |
||||||
|
/* add extra terminator codes for unused frames in last packet */ |
||||||
|
while (s->pkt_frame_count < s->frames_per_packet) { |
||||||
|
speex_bits_pack(&s->bits, 15, 5); |
||||||
|
s->pkt_frame_count++; |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
/* write output if all frames for the packet have been encoded */ |
||||||
|
if (s->pkt_frame_count == s->frames_per_packet) { |
||||||
|
s->pkt_frame_count = 0; |
||||||
|
avctx->coded_frame->pts = |
||||||
|
av_rescale_q(sample_count, (AVRational){ 1, avctx->sample_rate }, |
||||||
|
avctx->time_base); |
||||||
|
if (buf_size > speex_bits_nbytes(&s->bits)) { |
||||||
|
int ret = speex_bits_write(&s->bits, frame, buf_size); |
||||||
|
speex_bits_reset(&s->bits); |
||||||
|
return ret; |
||||||
|
} else { |
||||||
|
av_log(avctx, AV_LOG_ERROR, "output buffer too small"); |
||||||
|
return AVERROR(EINVAL); |
||||||
|
} |
||||||
|
} |
||||||
|
return 0; |
||||||
|
} |
||||||
|
|
||||||
|
static av_cold int encode_close(AVCodecContext *avctx) |
||||||
|
{ |
||||||
|
LibSpeexEncContext *s = avctx->priv_data; |
||||||
|
|
||||||
|
speex_bits_destroy(&s->bits); |
||||||
|
speex_encoder_destroy(s->enc_state); |
||||||
|
|
||||||
|
av_freep(&avctx->coded_frame); |
||||||
|
av_freep(&avctx->extradata); |
||||||
|
|
||||||
|
return 0; |
||||||
|
} |
||||||
|
|
||||||
|
#define OFFSET(x) offsetof(LibSpeexEncContext, x) |
||||||
|
#define AE AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM |
||||||
|
static const AVOption options[] = { |
||||||
|
{ "abr", "Use average bit rate", OFFSET(abr), AV_OPT_TYPE_INT, { 0 }, 0, 1, AE }, |
||||||
|
{ "cbr_quality", "Set quality value (0 to 10) for CBR", OFFSET(cbr_quality), AV_OPT_TYPE_INT, { 8 }, 0, 10, AE }, |
||||||
|
{ "frames_per_packet", "Number of frames to encode in each packet", OFFSET(frames_per_packet), AV_OPT_TYPE_INT, { 1 }, 1, 8, AE }, |
||||||
|
{ NULL }, |
||||||
|
}; |
||||||
|
|
||||||
|
static const AVClass class = { |
||||||
|
.class_name = "libspeex", |
||||||
|
.item_name = av_default_item_name, |
||||||
|
.option = options, |
||||||
|
.version = LIBAVUTIL_VERSION_INT, |
||||||
|
}; |
||||||
|
|
||||||
|
static const AVCodecDefault defaults[] = { |
||||||
|
{ "b", "0" }, |
||||||
|
{ "compression_level", "3" }, |
||||||
|
{ NULL }, |
||||||
|
}; |
||||||
|
|
||||||
|
AVCodec ff_libspeex_encoder = { |
||||||
|
.name = "libspeex", |
||||||
|
.type = AVMEDIA_TYPE_AUDIO, |
||||||
|
.id = CODEC_ID_SPEEX, |
||||||
|
.priv_data_size = sizeof(LibSpeexEncContext), |
||||||
|
.init = encode_init, |
||||||
|
.encode = encode_frame, |
||||||
|
.close = encode_close, |
||||||
|
.capabilities = CODEC_CAP_DELAY, |
||||||
|
.sample_fmts = (const enum SampleFormat[]){ AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE }, |
||||||
|
.long_name = NULL_IF_CONFIG_SMALL("libspeex Speex"), |
||||||
|
.priv_class = &class, |
||||||
|
.defaults = defaults, |
||||||
|
}; |
||||||
Loading…
Reference in new issue