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| 4349 | Serge | 1 | /* |
| 2 | * Copyright (C) 2008 David Conrad |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | #include |
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| 22 | #include |
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| 23 | #include |
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| 24 | #include |
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| 25 | |||
| 26 | #include "libavutil/channel_layout.h" |
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| 27 | #include "libavutil/common.h" |
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| 28 | #include "avcodec.h" |
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| 29 | #include "internal.h" |
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| 30 | |||
| 31 | typedef struct { |
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| 32 | SpeexBits bits; |
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| 33 | SpeexStereoState stereo; |
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| 34 | void *dec_state; |
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| 35 | int frame_size; |
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| 36 | } LibSpeexContext; |
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| 37 | |||
| 38 | |||
| 39 | static av_cold int libspeex_decode_init(AVCodecContext *avctx) |
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| 40 | { |
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| 41 | LibSpeexContext *s = avctx->priv_data; |
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| 42 | const SpeexMode *mode; |
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| 43 | SpeexHeader *header = NULL; |
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| 44 | int spx_mode; |
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| 45 | |||
| 46 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
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| 47 | if (avctx->extradata && avctx->extradata_size >= 80) { |
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| 48 | header = speex_packet_to_header(avctx->extradata, |
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| 49 | avctx->extradata_size); |
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| 50 | if (!header) |
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| 51 | av_log(avctx, AV_LOG_WARNING, "Invalid Speex header\n"); |
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| 52 | } |
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| 53 | if (avctx->codec_tag == MKTAG('S', 'P', 'X', 'N')) { |
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| 54 | if (!avctx->extradata || avctx->extradata && avctx->extradata_size < 47) { |
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| 55 | av_log(avctx, AV_LOG_ERROR, "Missing or invalid extradata.\n"); |
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| 56 | return AVERROR_INVALIDDATA; |
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| 57 | } |
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| 58 | if (avctx->extradata[37] != 10) { |
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| 59 | av_log(avctx, AV_LOG_ERROR, "Unsupported quality mode.\n"); |
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| 60 | return AVERROR_PATCHWELCOME; |
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| 61 | } |
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| 62 | spx_mode = 0; |
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| 63 | } else if (header) { |
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| 64 | avctx->sample_rate = header->rate; |
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| 65 | avctx->channels = header->nb_channels; |
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| 66 | spx_mode = header->mode; |
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| 67 | speex_header_free(header); |
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| 68 | } else { |
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| 69 | switch (avctx->sample_rate) { |
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| 70 | case 8000: spx_mode = 0; break; |
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| 71 | case 16000: spx_mode = 1; break; |
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| 72 | case 32000: spx_mode = 2; break; |
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| 73 | default: |
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| 74 | /* libspeex can handle any mode if initialized as ultra-wideband */ |
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| 75 | av_log(avctx, AV_LOG_WARNING, "Invalid sample rate: %d\n" |
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| 76 | "Decoding as 32kHz ultra-wideband\n", |
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| 77 | avctx->sample_rate); |
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| 78 | spx_mode = 2; |
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| 79 | } |
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| 80 | } |
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| 81 | |||
| 82 | mode = speex_lib_get_mode(spx_mode); |
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| 83 | if (!mode) { |
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| 84 | av_log(avctx, AV_LOG_ERROR, "Unknown Speex mode %d", spx_mode); |
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| 85 | return AVERROR_INVALIDDATA; |
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| 86 | } |
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| 87 | s->frame_size = 160 << spx_mode; |
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| 88 | if (!avctx->sample_rate) |
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| 89 | avctx->sample_rate = 8000 << spx_mode; |
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| 90 | |||
| 91 | if (avctx->channels < 1 || avctx->channels > 2) { |
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| 92 | /* libspeex can handle mono or stereo if initialized as stereo */ |
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| 93 | av_log(avctx, AV_LOG_ERROR, "Invalid channel count: %d.\n" |
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| 94 | "Decoding as stereo.\n", avctx->channels); |
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| 95 | avctx->channels = 2; |
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| 96 | } |
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| 97 | avctx->channel_layout = avctx->channels == 2 ? AV_CH_LAYOUT_STEREO : |
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| 98 | AV_CH_LAYOUT_MONO; |
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| 99 | |||
| 100 | speex_bits_init(&s->bits); |
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| 101 | s->dec_state = speex_decoder_init(mode); |
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| 102 | if (!s->dec_state) { |
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| 103 | av_log(avctx, AV_LOG_ERROR, "Error initializing libspeex decoder.\n"); |
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| 104 | return -1; |
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| 105 | } |
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| 106 | |||
| 107 | if (avctx->channels == 2) { |
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| 108 | SpeexCallback callback; |
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| 109 | callback.callback_id = SPEEX_INBAND_STEREO; |
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| 110 | callback.func = speex_std_stereo_request_handler; |
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| 111 | callback.data = &s->stereo; |
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| 112 | s->stereo = (SpeexStereoState)SPEEX_STEREO_STATE_INIT; |
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| 113 | speex_decoder_ctl(s->dec_state, SPEEX_SET_HANDLER, &callback); |
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| 114 | } |
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| 115 | |||
| 116 | return 0; |
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| 117 | } |
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| 118 | |||
| 119 | static int libspeex_decode_frame(AVCodecContext *avctx, void *data, |
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| 120 | int *got_frame_ptr, AVPacket *avpkt) |
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| 121 | { |
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| 122 | uint8_t *buf = avpkt->data; |
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| 123 | int buf_size = avpkt->size; |
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| 124 | LibSpeexContext *s = avctx->priv_data; |
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| 125 | AVFrame *frame = data; |
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| 126 | int16_t *output; |
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| 127 | int ret, consumed = 0; |
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| 128 | |||
| 129 | /* get output buffer */ |
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| 130 | frame->nb_samples = s->frame_size; |
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| 131 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
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| 132 | return ret; |
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| 133 | output = (int16_t *)frame->data[0]; |
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| 134 | |||
| 135 | /* if there is not enough data left for the smallest possible frame or the |
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| 136 | next 5 bits are a terminator code, reset the libspeex buffer using the |
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| 137 | current packet, otherwise ignore the current packet and keep decoding |
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| 138 | frames from the libspeex buffer. */ |
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| 139 | if (speex_bits_remaining(&s->bits) < 5 || |
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| 140 | speex_bits_peek_unsigned(&s->bits, 5) == 0xF) { |
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| 141 | /* check for flush packet */ |
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| 142 | if (!buf || !buf_size) { |
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| 143 | *got_frame_ptr = 0; |
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| 144 | return buf_size; |
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| 145 | } |
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| 146 | /* set new buffer */ |
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| 147 | speex_bits_read_from(&s->bits, buf, buf_size); |
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| 148 | consumed = buf_size; |
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| 149 | } |
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| 150 | |||
| 151 | /* decode a single frame */ |
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| 152 | ret = speex_decode_int(s->dec_state, &s->bits, output); |
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| 153 | if (ret <= -2) { |
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| 154 | av_log(avctx, AV_LOG_ERROR, "Error decoding Speex frame.\n"); |
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| 155 | return AVERROR_INVALIDDATA; |
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| 156 | } |
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| 157 | if (avctx->channels == 2) |
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| 158 | speex_decode_stereo_int(output, s->frame_size, &s->stereo); |
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| 159 | |||
| 160 | *got_frame_ptr = 1; |
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| 161 | |||
| 162 | return consumed; |
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| 163 | } |
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| 164 | |||
| 165 | static av_cold int libspeex_decode_close(AVCodecContext *avctx) |
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| 166 | { |
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| 167 | LibSpeexContext *s = avctx->priv_data; |
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| 168 | |||
| 169 | speex_bits_destroy(&s->bits); |
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| 170 | speex_decoder_destroy(s->dec_state); |
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| 171 | |||
| 172 | return 0; |
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| 173 | } |
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| 174 | |||
| 175 | static av_cold void libspeex_decode_flush(AVCodecContext *avctx) |
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| 176 | { |
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| 177 | LibSpeexContext *s = avctx->priv_data; |
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| 178 | speex_bits_reset(&s->bits); |
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| 179 | } |
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| 180 | |||
| 181 | AVCodec ff_libspeex_decoder = { |
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| 182 | .name = "libspeex", |
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| 183 | .long_name = NULL_IF_CONFIG_SMALL("libspeex Speex"), |
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| 184 | .type = AVMEDIA_TYPE_AUDIO, |
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| 185 | .id = AV_CODEC_ID_SPEEX, |
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| 186 | .priv_data_size = sizeof(LibSpeexContext), |
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| 187 | .init = libspeex_decode_init, |
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| 188 | .close = libspeex_decode_close, |
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| 189 | .decode = libspeex_decode_frame, |
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| 190 | .flush = libspeex_decode_flush, |
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| 191 | .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DELAY | CODEC_CAP_DR1, |
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| 192 | }; |