diff options
author | Diego Biurrun <diego@biurrun.de> | 2007-01-25 03:16:28 +0300 |
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committer | Diego Biurrun <diego@biurrun.de> | 2007-01-25 03:16:28 +0300 |
commit | 150d27725b8fc9240a8b9d51ae8606782494e2be (patch) | |
tree | 38c778d58e5ab6fcf7903c0285fae531b85f38c3 /libavcodec/libtheoraenc.c | |
parent | bf50703313fb9942ee1689550212a5aa66ff3328 (diff) |
Theora encoding via libtheora.
courtesy of Paul Richards, paul.richards gmail com
Originally committed as revision 7698 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/libtheoraenc.c')
-rw-r--r-- | libavcodec/libtheoraenc.c | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/libavcodec/libtheoraenc.c b/libavcodec/libtheoraenc.c new file mode 100644 index 0000000000..3fc70cf384 --- /dev/null +++ b/libavcodec/libtheoraenc.c @@ -0,0 +1,278 @@ +/* + * Copyright (c) 2006 Paul Richards <paul.richards@gmail.com> + * + * 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 St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/*! + * \file theoraenc.c + * \brief Theora encoder using libtheora. + * \author Paul Richards <paul.richards@gmail.com> + * + * A lot of this is copy / paste from other output codecs in + * libavcodec or pure guesswork (or both). + * + * I have used t_ prefixes on variables which are libtheora types + * and o_ prefixes on variables which are libogg types. + */ + +/* FFmpeg includes */ +#include "avcodec.h" +#include "log.h" + +/* libtheora includes */ +#include <theora/theora.h> + +typedef struct TheoraContext{ + theora_state t_state; +} TheoraContext; + +/*! + Concatenates an ogg_packet into the extradata. +*/ +static int concatenate_packet(unsigned int* offset, AVCodecContext* avc_context, const ogg_packet* packet) +{ + char* message = NULL; + uint8_t* newdata = NULL; + int newsize = avc_context->extradata_size + 2 + packet->bytes; + + if (packet->bytes < 0) { + message = "ogg_packet has negative size"; + } else if (packet->bytes > 0xffff) { + message = "ogg_packet is larger than 65535 bytes"; + } else if (newsize < avc_context->extradata_size) { + message = "extradata_size would overflow"; + } else { + newdata = av_realloc(avc_context->extradata, newsize); + if (newdata == NULL) { + message = "av_realloc failed"; + } + } + if (message != NULL) { + av_log(avc_context, AV_LOG_ERROR, "concatenate_packet failed: %s\n", message); + return -1; + } + + avc_context->extradata = newdata; + avc_context->extradata_size = newsize; + avc_context->extradata[ (*offset)++ ] = packet->bytes >> 8; + avc_context->extradata[ (*offset)++ ] = packet->bytes & 0xff; + memcpy( avc_context->extradata + (*offset), packet->packet, packet->bytes ); + (*offset) += packet->bytes; + return 0; +} + +static int encode_init(AVCodecContext* avc_context) +{ + theora_info t_info; + theora_comment t_comment; + ogg_packet o_packet; + unsigned int offset; + TheoraContext *h = avc_context->priv_data; + + /* Set up the theora_info struct */ + theora_info_init( &t_info ); + t_info.width = avc_context->width; + t_info.height = avc_context->height; + t_info.frame_width = avc_context->width; + t_info.frame_height = avc_context->height; + t_info.offset_x = 0; + t_info.offset_y = 0; + t_info.fps_numerator = avc_context->time_base.den; + t_info.fps_denominator = avc_context->time_base.num; + if (avc_context->sample_aspect_ratio.num != 0) { + t_info.aspect_numerator = avc_context->sample_aspect_ratio.num; + t_info.aspect_denominator = avc_context->sample_aspect_ratio.den; + } else { + t_info.aspect_numerator = 1; + t_info.aspect_denominator = 1; + } + t_info.colorspace = OC_CS_UNSPECIFIED; + t_info.pixelformat = OC_PF_420; + t_info.target_bitrate = avc_context->bit_rate; + t_info.keyframe_frequency = avc_context->gop_size; + t_info.keyframe_frequency_force = avc_context->gop_size; + t_info.keyframe_mindistance = avc_context->keyint_min; + t_info.quality = 0; + + t_info.quick_p = 1; + t_info.dropframes_p = 0; + t_info.keyframe_auto_p = 1; + t_info.keyframe_data_target_bitrate = t_info.target_bitrate * 1.5; + t_info.keyframe_auto_threshold = 80; + t_info.noise_sensitivity = 1; + t_info.sharpness = 0; + + /* Now initialise libtheora */ + if (theora_encode_init( &(h->t_state), &t_info ) != 0) { + av_log(avc_context, AV_LOG_ERROR, "theora_encode_init failed\n"); + return -1; + } + + /* Clear up theora_info struct */ + theora_info_clear( &t_info ); + + /* + Output first header packet consisting of theora + header, comment, and tables. + + Each one is prefixed with a 16bit size, then they + are concatenated together into ffmpeg's extradata. + */ + offset = 0; + + /* Header */ + theora_encode_header( &(h->t_state), &o_packet ); + if (concatenate_packet( &offset, avc_context, &o_packet ) != 0) { + return -1; + } + + /* Comment */ + theora_comment_init( &t_comment ); + theora_encode_comment( &t_comment, &o_packet ); + if (concatenate_packet( &offset, avc_context, &o_packet ) != 0) { + return -1; + } + + /* Tables */ + theora_encode_tables( &(h->t_state), &o_packet ); + if (concatenate_packet( &offset, avc_context, &o_packet ) != 0) { + return -1; + } + + /* Clear up theora_comment struct */ + theora_comment_clear( &t_comment ); + + /* Set up the output AVFrame */ + avc_context->coded_frame= avcodec_alloc_frame(); + + return 0; +} + +static int encode_frame( + AVCodecContext* avc_context, + uint8_t *outbuf, + int buf_size, + void *data) +{ + yuv_buffer t_yuv_buffer; + TheoraContext *h = avc_context->priv_data; + AVFrame *frame = data; + ogg_packet o_packet; + int result; + + assert(avc_context->pix_fmt == PIX_FMT_YUV420P); + + /* Copy planes to the theora yuv_buffer */ + if (frame->linesize[1] != frame->linesize[2]) { + av_log(avc_context, AV_LOG_ERROR, "U and V stride differ\n"); + return -1; + } + + t_yuv_buffer.y_width = avc_context->width; + t_yuv_buffer.y_height = avc_context->height; + t_yuv_buffer.y_stride = frame->linesize[0]; + t_yuv_buffer.uv_width = t_yuv_buffer.y_width / 2; + t_yuv_buffer.uv_height = t_yuv_buffer.y_height / 2; + t_yuv_buffer.uv_stride = frame->linesize[1]; + + t_yuv_buffer.y = frame->data[0]; + t_yuv_buffer.u = frame->data[1]; + t_yuv_buffer.v = frame->data[2]; + + /* Now call into theora_encode_YUVin */ + result = theora_encode_YUVin( &(h->t_state), &t_yuv_buffer ); + if (result != 0) { + const char* message; + switch (result) { + case -1: + message = "differing frame sizes"; + break; + case OC_EINVAL: + message = "encoder is not ready or is finished"; + break; + default: + message = "unknown reason"; + break; + } + av_log(avc_context, AV_LOG_ERROR, "theora_encode_YUVin failed (%s) [%d]\n", message, result); + return -1; + } + + /* Pick up returned ogg_packet */ + result = theora_encode_packetout( &(h->t_state), 0, &o_packet ); + switch (result) { + case 0: + /* No packet is ready */ + return 0; + case 1: + /* Success, we have a packet */ + break; + default: + av_log(avc_context, AV_LOG_ERROR, "theora_encode_packetout failed [%d]\n", result); + return -1; + } + + /* Copy ogg_packet content out to buffer */ + if (buf_size < o_packet.bytes) { + av_log(avc_context, AV_LOG_ERROR, "encoded frame too large\n"); + return -1; + } + memcpy(outbuf, o_packet.packet, o_packet.bytes); + + return o_packet.bytes; +} + +static int encode_close(AVCodecContext* avc_context) +{ + ogg_packet o_packet; + TheoraContext *h = avc_context->priv_data; + int result; + const char* message; + + result = theora_encode_packetout( &(h->t_state), 1, &o_packet ); + theora_clear( &(h->t_state) ); + switch (result) { + case 0:/* No packet is ready */ + case -1:/* Encoding finished */ + return 0; + case 1: + /* We have a packet */ + message = "gave us a packet"; + break; + default: + message = "unknown reason"; + break; + } + av_log(avc_context, AV_LOG_ERROR, "theora_encode_packetout failed (%s) [%d]\n", message, result); + return -1; +} + +static const enum PixelFormat supported_pixel_formats[] = { PIX_FMT_YUV420P, -1 }; + +/*! AVCodec struct exposed to libavcodec */ +AVCodec libtheora_encoder = +{ + .name = "libtheora", + .type = CODEC_TYPE_VIDEO, + .id = CODEC_ID_THEORA, + .priv_data_size = sizeof(TheoraContext), + .init = encode_init, + .close = encode_close, + .encode = encode_frame, + .pix_fmts = supported_pixel_formats, +}; |