+//Mimics codec2_samples_per_frame()
+static int codec2_mode_frame_size(AVFormatContext *s, int mode)
+{
+ int frame_size_table[CODEC2_MODE_MAX+1] = {
+ 160, // 3200
+ 160, // 2400
+ 320, // 1600
+ 320, // 1400
+ 320, // 1300
+ 320, // 1200
+ 320, // 700
+ 320, // 700B
+ 320, // 700C
+ };
+
+ if (mode < 0 || mode > CODEC2_MODE_MAX) {
+ av_log(s, AV_LOG_ERROR, "unknown codec2 mode %i, can't find frame_size\n", mode);
+ return 0;
+ } else {
+ return frame_size_table[mode];
+ }
+}
+
+//Mimics (codec2_bits_per_frame()+7)/8
+static int codec2_mode_block_align(AVFormatContext *s, int mode)
+{
+ int block_align_table[CODEC2_MODE_MAX+1] = {
+ 8, // 3200
+ 6, // 2400
+ 8, // 1600
+ 7, // 1400
+ 7, // 1300
+ 6, // 1200
+ 4, // 700
+ 4, // 700B
+ 4, // 700C
+ };
+
+ if (mode < 0 || mode > CODEC2_MODE_MAX) {
+ av_log(s, AV_LOG_ERROR, "unknown codec2 mode %i, can't find block_align\n", mode);
+ return 0;
+ } else {
+ return block_align_table[mode];
+ }
+}
+
+//Computes bitrate from mode, with frames rounded up to the nearest octet.
+//So 700 bit/s (28 bits/frame) becomes 800 bits/s (32 bits/frame).
+static int codec2_mode_bit_rate(AVFormatContext *s, int mode)
+{
+ int frame_size = codec2_mode_frame_size(s, mode);
+ int block_align = codec2_mode_block_align(s, mode);
+
+ if (frame_size <= 0 || block_align <= 0) {
+ return 0;
+ }
+
+ return 8 * 8000 * block_align / frame_size;
+}
+