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147 lines
6.4 KiB
147 lines
6.4 KiB
/* |
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Copyright (c) 2012, Broadcom Europe Ltd |
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All rights reserved. |
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions are met: |
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* Redistributions of source code must retain the above copyright |
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notice, this list of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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* Neither the name of the copyright holder nor the |
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names of its contributors may be used to endorse or promote products |
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derived from this software without specific prior written permission. |
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY |
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#define MPGA_HEADER_SIZE 6 |
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#define MPGA_MODE_STEREO 0 |
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#define MPGA_MODE_JSTEREO 1 |
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#define MPGA_MODE_DUAL 2 |
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#define MPGA_MODE_MONO 3 |
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/*****************************************************************************/ |
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static VC_CONTAINER_STATUS_T mpga_read_header( uint8_t frame_header[MPGA_HEADER_SIZE], |
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uint32_t *p_frame_size, unsigned int *p_frame_bitrate, unsigned int *p_version, |
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unsigned int *p_layer, unsigned int *p_sample_rate, unsigned int *p_channels, |
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unsigned int *p_frame_size_samples, unsigned int *p_offset ) |
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{ |
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static const uint16_t mpga_bitrate[2][3][15] = |
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{{{0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448}, /* MPEG1, Layer 1 */ |
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{0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384}, /* MPEG1, Layer 2 */ |
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{0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320}},/* MPEG1, Layer 3 */ |
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{{0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256}, /* MPEG2 and MPEG2.5, Layer 1 */ |
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{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160}, /* MPEG2 and MPEG2.5, Layer 2 */ |
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{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160}} /* MPEG2 and MPEG2.5, Layer 3 */}; |
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static const uint16_t mpga_sample_rate[] = {44100, 48000, 32000}; |
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static const uint16_t mpga_frame_size[] = {384, 1152, 576}; |
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unsigned int version, layer, br_id, sr_id, emphasis; |
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unsigned int bitrate, sample_rate, padding, mode; |
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/* Check frame sync, 11 bits as we want to allow for MPEG2.5 */ |
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if (frame_header[0] != 0xff || (frame_header[1] & 0xe0) != 0xe0) |
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return VC_CONTAINER_ERROR_FORMAT_INVALID; |
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version = 4 - ((frame_header[1] >> 3) & 3); |
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layer = 4 - ((frame_header[1] >> 1) & 3 ); |
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br_id = (frame_header[2] >> 4) & 0xf; |
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sr_id = (frame_header[2] >> 2) & 3; |
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padding = (frame_header[2] >> 1) & 1; |
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mode = (frame_header[3] >> 6) & 3; |
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emphasis = (frame_header[3]) & 3; |
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/* Check for invalid values */ |
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if (version == 3 || layer == 4 || br_id == 15 || sr_id == 3 || emphasis == 2) |
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return VC_CONTAINER_ERROR_FORMAT_INVALID; |
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if (version == 4) version = 3; |
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bitrate = mpga_bitrate[version == 1 ? 0 : 1][layer-1][br_id]; |
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bitrate *= 1000; |
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sample_rate = mpga_sample_rate[sr_id]; |
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sample_rate >>= (version - 1); |
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if (p_version) *p_version = version; |
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if (p_layer) *p_layer = layer; |
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if (p_sample_rate) *p_sample_rate = sample_rate; |
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if (p_channels) *p_channels = mode == MPGA_MODE_MONO ? 1 : 2; |
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if (p_frame_bitrate) *p_frame_bitrate = bitrate; |
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if (p_offset) *p_offset = 0; |
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if (p_frame_size_samples) |
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{ |
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*p_frame_size_samples = mpga_frame_size[layer - 1]; |
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if (version == 1 && layer == 3) *p_frame_size_samples <<= 1; |
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} |
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if (!p_frame_size) |
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return VC_CONTAINER_SUCCESS; |
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if (!bitrate) |
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*p_frame_size = 0; |
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else if (layer == 1) |
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*p_frame_size = (padding + bitrate * 12 / sample_rate) * 4; |
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else if (layer == 2) |
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*p_frame_size = padding + bitrate * 144 / sample_rate; |
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else |
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*p_frame_size = padding + bitrate * (version == 1 ? 144 : 72) / sample_rate; |
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return VC_CONTAINER_SUCCESS; |
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} |
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/*****************************************************************************/ |
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static VC_CONTAINER_STATUS_T adts_read_header( uint8_t frame_header[MPGA_HEADER_SIZE], |
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uint32_t *p_frame_size, unsigned int *p_frame_bitrate, unsigned int *p_version, |
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unsigned int *p_layer, unsigned int *p_sample_rate, unsigned int *p_channels, |
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unsigned int *p_frame_size_samples, unsigned int *p_offset ) |
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{ |
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static const unsigned int adts_sample_rate[16] = |
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{96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 7350}; |
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unsigned int profile, sr_id, bitrate, sample_rate, frame_size, channels, crc; |
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unsigned int frame_size_samples = 1024; |
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/* Check frame sync (12 bits) */ |
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if (frame_header[0] != 0xff || (frame_header[1] & 0xf0) != 0xf0) |
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return VC_CONTAINER_ERROR_FORMAT_INVALID; |
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/* Layer must be 0 */ |
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if ((frame_header[1] >> 1) & 3) |
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return VC_CONTAINER_ERROR_FORMAT_INVALID; |
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crc = !(frame_header[1] & 0x1); |
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profile = (frame_header[2] >> 6) + 1; /* MPEG-4 Audio Object Type */ |
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sr_id = (frame_header[2] >> 2) & 0xf; |
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sample_rate = adts_sample_rate[sr_id]; |
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channels = ((frame_header[2] & 0x1) << 2) | ((frame_header[3] >> 6) & 0x3); |
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frame_size = ((frame_header[3] & 0x03) << 11) | (frame_header[4] << 3) | (frame_header[5] >> 5); |
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if (!sample_rate || !channels || !frame_size) |
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return VC_CONTAINER_ERROR_FORMAT_INVALID; |
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bitrate = frame_size * 8 * sample_rate / frame_size_samples; |
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if (p_version) *p_version = profile; |
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if (p_layer) *p_layer = 0; |
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if (p_sample_rate) *p_sample_rate = sample_rate; |
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if (p_channels) *p_channels = channels; |
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if (p_frame_bitrate) *p_frame_bitrate = bitrate; |
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if (p_frame_size) *p_frame_size = frame_size; |
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if (p_frame_size_samples) *p_frame_size_samples = frame_size_samples; |
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if (p_offset) *p_offset = crc ? 9 : 7; |
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return VC_CONTAINER_SUCCESS; |
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}
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