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  1. /*
  2.  * Copyright (c) 2002 Mark Hills <mark@pogo.org.uk>
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include <vorbis/vorbisenc.h>
  22.  
  23. #include "libavutil/avassert.h"
  24. #include "libavutil/fifo.h"
  25. #include "libavutil/opt.h"
  26. #include "avcodec.h"
  27. #include "audio_frame_queue.h"
  28. #include "internal.h"
  29. #include "vorbis.h"
  30. #include "vorbis_parser.h"
  31.  
  32.  
  33. /* Number of samples the user should send in each call.
  34.  * This value is used because it is the LCD of all possible frame sizes, so
  35.  * an output packet will always start at the same point as one of the input
  36.  * packets.
  37.  */
  38. #define LIBVORBIS_FRAME_SIZE 64
  39.  
  40. #define BUFFER_SIZE (1024 * 64)
  41.  
  42. typedef struct LibvorbisEncContext {
  43.     AVClass *av_class;                  /**< class for AVOptions            */
  44.     vorbis_info vi;                     /**< vorbis_info used during init   */
  45.     vorbis_dsp_state vd;                /**< DSP state used for analysis    */
  46.     vorbis_block vb;                    /**< vorbis_block used for analysis */
  47.     AVFifoBuffer *pkt_fifo;             /**< output packet buffer           */
  48.     int eof;                            /**< end-of-file flag               */
  49.     int dsp_initialized;                /**< vd has been initialized        */
  50.     vorbis_comment vc;                  /**< VorbisComment info             */
  51.     double iblock;                      /**< impulse block bias option      */
  52.     AVVorbisParseContext *vp;           /**< parse context to get durations */
  53.     AudioFrameQueue afq;                /**< frame queue for timestamps     */
  54. } LibvorbisEncContext;
  55.  
  56. static const AVOption options[] = {
  57.     { "iblock", "Sets the impulse block bias", offsetof(LibvorbisEncContext, iblock), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, -15, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
  58.     { NULL }
  59. };
  60.  
  61. static const AVCodecDefault defaults[] = {
  62.     { "b",  "0" },
  63.     { NULL },
  64. };
  65.  
  66. static const AVClass vorbis_class = {
  67.     .class_name = "libvorbis",
  68.     .item_name  = av_default_item_name,
  69.     .option     = options,
  70.     .version    = LIBAVUTIL_VERSION_INT,
  71. };
  72.  
  73. static int vorbis_error_to_averror(int ov_err)
  74. {
  75.     switch (ov_err) {
  76.     case OV_EFAULT: return AVERROR_BUG;
  77.     case OV_EINVAL: return AVERROR(EINVAL);
  78.     case OV_EIMPL:  return AVERROR(EINVAL);
  79.     default:        return AVERROR_UNKNOWN;
  80.     }
  81. }
  82.  
  83. static av_cold int libvorbis_setup(vorbis_info *vi, AVCodecContext *avctx)
  84. {
  85.     LibvorbisEncContext *s = avctx->priv_data;
  86.     double cfreq;
  87.     int ret;
  88.  
  89.     if (avctx->flags & AV_CODEC_FLAG_QSCALE || !avctx->bit_rate) {
  90.         /* variable bitrate
  91.          * NOTE: we use the oggenc range of -1 to 10 for global_quality for
  92.          *       user convenience, but libvorbis uses -0.1 to 1.0.
  93.          */
  94.         float q = avctx->global_quality / (float)FF_QP2LAMBDA;
  95.         /* default to 3 if the user did not set quality or bitrate */
  96.         if (!(avctx->flags & AV_CODEC_FLAG_QSCALE))
  97.             q = 3.0;
  98.         if ((ret = vorbis_encode_setup_vbr(vi, avctx->channels,
  99.                                            avctx->sample_rate,
  100.                                            q / 10.0)))
  101.             goto error;
  102.     } else {
  103.         int minrate = avctx->rc_min_rate > 0 ? avctx->rc_min_rate : -1;
  104.         int maxrate = avctx->rc_max_rate > 0 ? avctx->rc_max_rate : -1;
  105.  
  106.         /* average bitrate */
  107.         if ((ret = vorbis_encode_setup_managed(vi, avctx->channels,
  108.                                                avctx->sample_rate, maxrate,
  109.                                                avctx->bit_rate, minrate)))
  110.             goto error;
  111.  
  112.         /* variable bitrate by estimate, disable slow rate management */
  113.         if (minrate == -1 && maxrate == -1)
  114.             if ((ret = vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE2_SET, NULL)))
  115.                 goto error; /* should not happen */
  116.     }
  117.  
  118.     /* cutoff frequency */
  119.     if (avctx->cutoff > 0) {
  120.         cfreq = avctx->cutoff / 1000.0;
  121.         if ((ret = vorbis_encode_ctl(vi, OV_ECTL_LOWPASS_SET, &cfreq)))
  122.             goto error; /* should not happen */
  123.     }
  124.  
  125.     /* impulse block bias */
  126.     if (s->iblock) {
  127.         if ((ret = vorbis_encode_ctl(vi, OV_ECTL_IBLOCK_SET, &s->iblock)))
  128.             goto error;
  129.     }
  130.  
  131.     if (avctx->channels == 3 &&
  132.             avctx->channel_layout != (AV_CH_LAYOUT_STEREO|AV_CH_FRONT_CENTER) ||
  133.         avctx->channels == 4 &&
  134.             avctx->channel_layout != AV_CH_LAYOUT_2_2 &&
  135.             avctx->channel_layout != AV_CH_LAYOUT_QUAD ||
  136.         avctx->channels == 5 &&
  137.             avctx->channel_layout != AV_CH_LAYOUT_5POINT0 &&
  138.             avctx->channel_layout != AV_CH_LAYOUT_5POINT0_BACK ||
  139.         avctx->channels == 6 &&
  140.             avctx->channel_layout != AV_CH_LAYOUT_5POINT1 &&
  141.             avctx->channel_layout != AV_CH_LAYOUT_5POINT1_BACK ||
  142.         avctx->channels == 7 &&
  143.             avctx->channel_layout != (AV_CH_LAYOUT_5POINT1|AV_CH_BACK_CENTER) ||
  144.         avctx->channels == 8 &&
  145.             avctx->channel_layout != AV_CH_LAYOUT_7POINT1) {
  146.         if (avctx->channel_layout) {
  147.             char name[32];
  148.             av_get_channel_layout_string(name, sizeof(name), avctx->channels,
  149.                                          avctx->channel_layout);
  150.             av_log(avctx, AV_LOG_ERROR, "%s not supported by Vorbis: "
  151.                                              "output stream will have incorrect "
  152.                                              "channel layout.\n", name);
  153.         } else {
  154.             av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The encoder "
  155.                                                "will use Vorbis channel layout for "
  156.                                                "%d channels.\n", avctx->channels);
  157.         }
  158.     }
  159.  
  160.     if ((ret = vorbis_encode_setup_init(vi)))
  161.         goto error;
  162.  
  163.     return 0;
  164. error:
  165.     return vorbis_error_to_averror(ret);
  166. }
  167.  
  168. /* How many bytes are needed for a buffer of length 'l' */
  169. static int xiph_len(int l)
  170. {
  171.     return 1 + l / 255 + l;
  172. }
  173.  
  174. static av_cold int libvorbis_encode_close(AVCodecContext *avctx)
  175. {
  176.     LibvorbisEncContext *s = avctx->priv_data;
  177.  
  178.     /* notify vorbisenc this is EOF */
  179.     if (s->dsp_initialized)
  180.         vorbis_analysis_wrote(&s->vd, 0);
  181.  
  182.     vorbis_block_clear(&s->vb);
  183.     vorbis_dsp_clear(&s->vd);
  184.     vorbis_info_clear(&s->vi);
  185.  
  186.     av_fifo_freep(&s->pkt_fifo);
  187.     ff_af_queue_close(&s->afq);
  188.     av_freep(&avctx->extradata);
  189.  
  190.     av_vorbis_parse_free(&s->vp);
  191.  
  192.     return 0;
  193. }
  194.  
  195. static av_cold int libvorbis_encode_init(AVCodecContext *avctx)
  196. {
  197.     LibvorbisEncContext *s = avctx->priv_data;
  198.     ogg_packet header, header_comm, header_code;
  199.     uint8_t *p;
  200.     unsigned int offset;
  201.     int ret;
  202.  
  203.     vorbis_info_init(&s->vi);
  204.     if ((ret = libvorbis_setup(&s->vi, avctx))) {
  205.         av_log(avctx, AV_LOG_ERROR, "encoder setup failed\n");
  206.         goto error;
  207.     }
  208.     if ((ret = vorbis_analysis_init(&s->vd, &s->vi))) {
  209.         av_log(avctx, AV_LOG_ERROR, "analysis init failed\n");
  210.         ret = vorbis_error_to_averror(ret);
  211.         goto error;
  212.     }
  213.     s->dsp_initialized = 1;
  214.     if ((ret = vorbis_block_init(&s->vd, &s->vb))) {
  215.         av_log(avctx, AV_LOG_ERROR, "dsp init failed\n");
  216.         ret = vorbis_error_to_averror(ret);
  217.         goto error;
  218.     }
  219.  
  220.     vorbis_comment_init(&s->vc);
  221.     if (!(avctx->flags & AV_CODEC_FLAG_BITEXACT))
  222.         vorbis_comment_add_tag(&s->vc, "encoder", LIBAVCODEC_IDENT);
  223.  
  224.     if ((ret = vorbis_analysis_headerout(&s->vd, &s->vc, &header, &header_comm,
  225.                                          &header_code))) {
  226.         ret = vorbis_error_to_averror(ret);
  227.         goto error;
  228.     }
  229.  
  230.     avctx->extradata_size = 1 + xiph_len(header.bytes)      +
  231.                                 xiph_len(header_comm.bytes) +
  232.                                 header_code.bytes;
  233.     p = avctx->extradata = av_malloc(avctx->extradata_size +
  234.                                      AV_INPUT_BUFFER_PADDING_SIZE);
  235.     if (!p) {
  236.         ret = AVERROR(ENOMEM);
  237.         goto error;
  238.     }
  239.     p[0]    = 2;
  240.     offset  = 1;
  241.     offset += av_xiphlacing(&p[offset], header.bytes);
  242.     offset += av_xiphlacing(&p[offset], header_comm.bytes);
  243.     memcpy(&p[offset], header.packet, header.bytes);
  244.     offset += header.bytes;
  245.     memcpy(&p[offset], header_comm.packet, header_comm.bytes);
  246.     offset += header_comm.bytes;
  247.     memcpy(&p[offset], header_code.packet, header_code.bytes);
  248.     offset += header_code.bytes;
  249.     av_assert0(offset == avctx->extradata_size);
  250.  
  251.     s->vp = av_vorbis_parse_init(avctx->extradata, avctx->extradata_size);
  252.     if (!s->vp) {
  253.         av_log(avctx, AV_LOG_ERROR, "invalid extradata\n");
  254.         return ret;
  255.     }
  256.  
  257.     vorbis_comment_clear(&s->vc);
  258.  
  259.     avctx->frame_size = LIBVORBIS_FRAME_SIZE;
  260.     ff_af_queue_init(avctx, &s->afq);
  261.  
  262.     s->pkt_fifo = av_fifo_alloc(BUFFER_SIZE);
  263.     if (!s->pkt_fifo) {
  264.         ret = AVERROR(ENOMEM);
  265.         goto error;
  266.     }
  267.  
  268.     return 0;
  269. error:
  270.     libvorbis_encode_close(avctx);
  271.     return ret;
  272. }
  273.  
  274. static int libvorbis_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
  275.                                   const AVFrame *frame, int *got_packet_ptr)
  276. {
  277.     LibvorbisEncContext *s = avctx->priv_data;
  278.     ogg_packet op;
  279.     int ret, duration;
  280.  
  281.     /* send samples to libvorbis */
  282.     if (frame) {
  283.         const int samples = frame->nb_samples;
  284.         float **buffer;
  285.         int c, channels = s->vi.channels;
  286.  
  287.         buffer = vorbis_analysis_buffer(&s->vd, samples);
  288.         for (c = 0; c < channels; c++) {
  289.             int co = (channels > 8) ? c :
  290.                      ff_vorbis_encoding_channel_layout_offsets[channels - 1][c];
  291.             memcpy(buffer[c], frame->extended_data[co],
  292.                    samples * sizeof(*buffer[c]));
  293.         }
  294.         if ((ret = vorbis_analysis_wrote(&s->vd, samples)) < 0) {
  295.             av_log(avctx, AV_LOG_ERROR, "error in vorbis_analysis_wrote()\n");
  296.             return vorbis_error_to_averror(ret);
  297.         }
  298.         if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
  299.             return ret;
  300.     } else {
  301.         if (!s->eof && s->afq.frame_alloc)
  302.             if ((ret = vorbis_analysis_wrote(&s->vd, 0)) < 0) {
  303.                 av_log(avctx, AV_LOG_ERROR, "error in vorbis_analysis_wrote()\n");
  304.                 return vorbis_error_to_averror(ret);
  305.             }
  306.         s->eof = 1;
  307.     }
  308.  
  309.     /* retrieve available packets from libvorbis */
  310.     while ((ret = vorbis_analysis_blockout(&s->vd, &s->vb)) == 1) {
  311.         if ((ret = vorbis_analysis(&s->vb, NULL)) < 0)
  312.             break;
  313.         if ((ret = vorbis_bitrate_addblock(&s->vb)) < 0)
  314.             break;
  315.  
  316.         /* add any available packets to the output packet buffer */
  317.         while ((ret = vorbis_bitrate_flushpacket(&s->vd, &op)) == 1) {
  318.             if (av_fifo_space(s->pkt_fifo) < sizeof(ogg_packet) + op.bytes) {
  319.                 av_log(avctx, AV_LOG_ERROR, "packet buffer is too small\n");
  320.                 return AVERROR_BUG;
  321.             }
  322.             av_fifo_generic_write(s->pkt_fifo, &op, sizeof(ogg_packet), NULL);
  323.             av_fifo_generic_write(s->pkt_fifo, op.packet, op.bytes, NULL);
  324.         }
  325.         if (ret < 0) {
  326.             av_log(avctx, AV_LOG_ERROR, "error getting available packets\n");
  327.             break;
  328.         }
  329.     }
  330.     if (ret < 0) {
  331.         av_log(avctx, AV_LOG_ERROR, "error getting available packets\n");
  332.         return vorbis_error_to_averror(ret);
  333.     }
  334.  
  335.     /* check for available packets */
  336.     if (av_fifo_size(s->pkt_fifo) < sizeof(ogg_packet))
  337.         return 0;
  338.  
  339.     av_fifo_generic_read(s->pkt_fifo, &op, sizeof(ogg_packet), NULL);
  340.  
  341.     if ((ret = ff_alloc_packet2(avctx, avpkt, op.bytes, 0)) < 0)
  342.         return ret;
  343.     av_fifo_generic_read(s->pkt_fifo, avpkt->data, op.bytes, NULL);
  344.  
  345.     avpkt->pts = ff_samples_to_time_base(avctx, op.granulepos);
  346.  
  347.     duration = av_vorbis_parse_frame(s->vp, avpkt->data, avpkt->size);
  348.     if (duration > 0) {
  349.         /* we do not know encoder delay until we get the first packet from
  350.          * libvorbis, so we have to update the AudioFrameQueue counts */
  351.         if (!avctx->initial_padding && s->afq.frames) {
  352.             avctx->initial_padding    = duration;
  353.             av_assert0(!s->afq.remaining_delay);
  354.             s->afq.frames->duration  += duration;
  355.             if (s->afq.frames->pts != AV_NOPTS_VALUE)
  356.                 s->afq.frames->pts       -= duration;
  357.             s->afq.remaining_samples += duration;
  358.         }
  359.         ff_af_queue_remove(&s->afq, duration, &avpkt->pts, &avpkt->duration);
  360.     }
  361.  
  362.     *got_packet_ptr = 1;
  363.     return 0;
  364. }
  365.  
  366. AVCodec ff_libvorbis_encoder = {
  367.     .name           = "libvorbis",
  368.     .long_name      = NULL_IF_CONFIG_SMALL("libvorbis"),
  369.     .type           = AVMEDIA_TYPE_AUDIO,
  370.     .id             = AV_CODEC_ID_VORBIS,
  371.     .priv_data_size = sizeof(LibvorbisEncContext),
  372.     .init           = libvorbis_encode_init,
  373.     .encode2        = libvorbis_encode_frame,
  374.     .close          = libvorbis_encode_close,
  375.     .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SMALL_LAST_FRAME,
  376.     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
  377.                                                       AV_SAMPLE_FMT_NONE },
  378.     .priv_class     = &vorbis_class,
  379.     .defaults       = defaults,
  380. };
  381.